An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>

Number of Results: 13176 Search : far
burster
  بلکور   
belkvar

Fr.: source à sursaut   

A → source that shows sudden intense → emission of → X-rays or → gamma rays with a rapid rise and decay. Often it cannot be identified with any → optical counterpart.

From → burst + -er a noun-forming suffix.

Belkvar, from belk, → burst, + agent noun suffix -var.

butterfly diagram
  نمودار ِ پروانه‌وار   
nemudâr-e parvânevâr

Fr.: diagramme en papillon   

A graph on which the latitudes of → sunspots are plotted against time. It shows how sunspots migrate from high latitudes (30°- 40° north or south) to the solar equator (latitude of about 5°) during each → solar cycle, according to → Sporer's law. The shape of these distributions, when represented for both hemispheres, resembles the wings of a butterfly. The diagram was first created by Edward W. Maunder in 1904 to illustrate the solar cycle (M.S.: SDE).

Butterfly, from M.E. butterflye, from O.E. butorfleoge, from butor, butere "butter" floge "fly," but the etymology is not clear; → diagram.

Nemudâr, → diagram; parvânevâr "resembling a butterfly," from parvâné "butterfly" + -vâr similarity suffix.

buttock
  سرین   
sorin (#)

Fr.: fesse   

1) Either of the two large fleshy masses of thick muscular tissue that form the human rump.
2) In animals, the → rump (Dictionary.com).

M.E. buttok, maybe from O.E. buttuc "end; end piece; short piece of land."

Sorin, variant sarun; Mid.Pers. sarinak, srinak (Sogdian šun / šôn "hip, haunch"); Av. sraoni- "buttok, hip;" Skt. śroni- "the hip and loins," Pali soni- "the buttock."

by
  پت   
pat

Fr.: par   

A preposition used to indicate the agent after a passive verb. By means of.

M.E., O.E. bi "near, in, by, during, about;" cf. O.S. and O.Fr. bi, M.Du., Du. bij, Ger. bei;cf. Skt. abhi "toward, to," Gk. amphi- "around, about;" Av. aibi, aiwi, O.Pers. aiby, Pers. af-.

Pat, from Mid.Pers. pat, pad "to, at, in, on" (Mod.Pers. ); O.Pers. patiy, Av. paiti "to, at, for, with, by mean of," cf. Skt. práti "toward, against, again, back, in return, opposite;" Pali pati-; Gk. proti, pros "face to face with, toward, in addition to, near;" PIE *proti.

by default
  پت نابون   
pat nâbun

Fr.: par défaut   

Because of a lack of opposition or alternative.

by; → default.

B[e] star
  ستاره‌یِ B[e]   
setâre-ye B[e]

Fr.: étoile B[e]   

A → Be star with → forbidden lines in emission in its spectrum. B[e] stars show large → infrared excess due to → circumstellar dust emission. See also → supergiant B[e] star, → pre-main sequence B[e] star, → compact planetary nebula B[e] star, → symbiotic B[e] star, and → unclassified B[e] star.

B, referring to the spectral type; e for emission lines, brackets for distinction from Be; → star.

c Orionis
   c-شکارگر، c-اریون   
c-Šekârgar, c-Oyon

Fr.: c Orionis   

Same as → 42 Orionis.

Star name in the → Bayer designation scheme.

C ring
  حلقه‌ی ِ C   
halqe-ye C

Fr.: anneau C   

One of → Saturn's rings, lying beyond the → D ring and before the → B ring, at 74,658 km from the center of Saturn, with a width of 17,500 km. Same as the → Crepe ring.

ring.

C-symmetry
  همامونی ِ بار   
hamâmuni-ye bâr

Fr.: symétrie de charge   

Same as → charge conjugation and → charge symmetry.

charge; → symmetry.

C-type asteroid
  سیارک ِ گونه‌ی ِ C   
sayârak-e gune-ye C

Fr.: astéroïde de type C   

An → asteroid that belongs to the family of → carbonaceous asteroids. They are → depleted in → hydrogen and → helium, have chemical ratios akin to solar composition, and show low → albedo (0.03-0.09). C-type asteroids are the most common variety, forming around 75% of known asteroids. They inhabit → main belt's outer regions.

C stands for → carbonaceous; → type; → asteroid.

Caelum
  قلم   
qalam (#)

Fr.: Burin   

The Sculptor's Chisel. A small inconspicuous → constellation in the southern sky, representing a sculptor's chisel. Its brightest star, Alpha Caeli, is magnitude 4.5. Approximate position: R.A. 4.5 h, Dec.: -40°; abbreviation: Cae, genitive form Caeli.

L. caelum sculptor's "chisel."

Qalam "chisel," from Ar., related to L. caelum?

cage
  قفس   
qafas (#)

Fr.: cage   

1) An enclosure, usually made with bars or wire, for keeping birds or wild animals.
2) An enclosed structure resembling a cage. → observer's cage, → Faraday cage.

M.E. from O.Fr. cage, from L. cavea "hollow place, enclosure for animals," cognate with Pers. kâv "hollow," → concave.

Qafas "cage," of unknown origin.

CAI meteorite
  شخانه‌ی ِ CAI، شهاب‌سنگ ِ ~   
šaxâne-ye CAI, šahânsang-e ~

Fr.: météorite de type CAI   

A member of a group of tiny (millimeter to centimeter) light-colored meteorites found often with → chondrules. They consist of high vaporization minerals, including → silicates and → oxides of Ca, Al, and Ti, but are quite poor in Fe. Compared to common → chondrules, which are uniformly spherical, their shapes are less regular. They appear to be 2-3 million years older than chondrules. CAI meteorites are probably the oldest solid materials to have formed in the → solar nebula.

CAI, short for → Calcium, → Aluminium, and → Inclusion; → meteorite.

CAK model
  مدل ِ CAK   
model-e CAK

Fr.: modèle CAK   

The standard model of → radiation-driven winds in which the acceleration of → stellar wind is provided by the → absorption and → scattering of ultraviolet photons in ions of abundant elements (→ CNO, → iron peak) in the → Lyman continuum. The model was developed by Castor et al. (1975), who assumed that the forces due to the radiative lines and the pressure gradients are functions of local velocity gradient, and used a large number (~ 105) of lines which have a statistical distribution in line strengths. The model led to predictions of → mass loss rates (M_dot) and terminal velocities as a function of stellar properties and the line statistics parameters. With the modifications by Friend and Abbott (1986), Pauldrach et al. (1986), and Kudritzki et al. (1989), CAK multi-line theory gives good agreement with observationally derived values of mass loss rate and → terminal velocity (v). CAK wind solutions predict the terminal velocity to be proportional to the → escape velocity and the mass loss rate to depend strongly on the stellar → luminosity. Observations over the past decades have shown that these main wind parameters, M_dot and v, indeed behave as predicted by CAK. This basic agreement between observations and theory provides strong evidence that the winds from → massive stars are driven by → radiation pressure and this has favored the CAK formalism. See also → multiple scattering. See the review by J. Puls et al. 2008, Astron. Astrophys. Rev. 16, 209.

CAK, the initials of the researchers who developed the model: J.I. Castor, D.C. Abbott, and R.I. Klein(1975, Radiation-driven winds in Of stars, ApJ 195, 157); → model.

Calabash Nebula
  میغ ِ کالاباش   
Miq-e Kââbâš

Fr.: nébuleuse de l'œuf pourri   

A → bipolar nebula and → OH/IR source with technical designation OH 231.8+4.2. It is a → proto-planetary nebula (PPN) 1.4 → light-years long and located some 5,000 light-years from Earth in the constellation → Puppis. The obscured → central star, named QX Pup, is classified as M9-10 III and has a → Mira-like variability consistent with an evolved → asymptotic giant branch (AGB) star. The late evolution of this object may have been complex since it has a binary → companion star (of type A0 V) that has been indirectly identified from analysis of the spectrum of the hidden central source reflected by the nebular dust. The system has a total luminosity of ~ 104 Lsun and its systemic velocity relative to the → Local Standard of Rest is VLSR ~ 34 km s-1. OH 231.8+4.2 is very likely a member of the → open cluster M46 with a progenitor mass of ~ 3 Msun. The nebula is also known as the Rotten Egg Nebula because it contains a lot of sulphur, an element that, when combined with other elements, smells like a rotten egg (see, e.g., Prieto et al., 2015, A&A, 575, A84).

The name "Calabash Nebula" was first proposed by Icke & Preston, 1989, A&A, 211, 409. It refers to the apparent form of the object which resembles a calabash "a tree that has large, rounded gourdlike fruit; the fruit of any of these plants," from Sp. calabaza, possibly from Ar. qar'ah yâbisah "dry gourd," from Pers. kharabuz, used of various large melons; → nebula.

calcium
  کلسیوم   
kalsiom (#)

Fr.: calcium   

A metallic chemical element; symbol Ca. → Atomic number 20; → atomic weight 40.08; → melting point about 839°C; → boiling point 1,484°C; → specific gravity 1.55 at 20°C; → valence +2. It is fifth in abundance in the Earth's crust, of which it forms more than 3%. It is an essential constituent of leaves, bones, teeth, and shells. Never found in nature uncombined, it occurs abundantly as limestone, gypsum, and fluorite. Calcium has several radioactive isotopes. It was first isolated by the British chemist Humphry Davy in 1808.

Coined by Sir Humphry Davy from L. calx (genitive calcis) "lime (CaO) or limestone (CaCO3)" in which it was found, from Gk. khalix "small pebble," see also → calculate, + → -ium.

calcium break
  گسست ِ کلسیوم   
gosast-e kalsiom

Fr.: coupure de calcium   

A discontinuity in the spectrum of galaxies near the Ca II → H and K lines at about 4000 Å. The Ca break is the most prominent feature in the spectra of elliptical galaxies. Its strength is given by the → calcium break index.

calcium; → break.

calcium break index
  دیشن ِ گسست ِ کلسیوم   
dišan-e gosast-e kalsiom

Fr.: indice de la coupure de calcium   

The strength of the → calcium break, as measured from the fluxes in the intervals 3750-3950 Å and 4050-4250 Å. It is given by the expression Ca-break[%] = 100 · (fupper - flower)/fupper, where fupper and flower are the mean fluxes measured in the 3750-3950 Å and 4050-4250 Å bands, respectively, in the rest frame (Dressler & Shectman 1987, AJ 94, 899).

calcium; → break; → index.

calculate
  افماردن   
afmârdan

Fr.: calculer   

To perform a mathematical process; to reckon; to make an estimate of; evaluate. → compute; → count; → mathematics; → statistics.

Calculate, from L.L. calculare, calculat-, from L. calculus "small stone, pebble" (used in reckoning), dim. of calx, calc- "limestone," from Gk. khalix "small pebble," kakhlex "round pebble,"cf. O.E. hægl, hagol "hale," from W.Gmc. *haglaz, O.H.G. hagal, O.N. hagl, Ger. Hagel "hail", PIE *kaghlo- "pebble, hail." The Pers. cognate is probably the Lori hogela "big stone."

Afmârdan, from prefix af- + stem mar- + infinitive suffix -idan. The Mod.Pers. prefix af- "to, up, upon," occurring in several words (e.g. afzudan, afruxtan, afsar, afsâr, afqân), derives from O.Pers./Av. abiy-/aiwi- "to, upon, against;" cf. Skt. abhi-, Gk. amphi-. The stem mar-, mâr- "count, reckon, measure," which occurs in several Mid./Mod.Pers. terms (e.g. ošmârdan, šomârdan, šomordan "to count, to calculate," âmâr "computation, arithmetic; statistics," âmârdan "to reckon, to calculate," bimar "countless," nahmâr "great, large, big"), is related to the Av. base mar- "to have in mind, remember, recall," hišmar-; cf. Skt. smr-, smarati "to remember, he remembers," L. memor, memoria, Gk. mermera "care," martyr "witness."

calculation
  افمارش   
afmâreš

Fr.: calcul   

The act, process, or result of calculating.

Calculation, noun from → calculate.

Afmâreš, verbal noun from afmârdancalculate.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>