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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13176 Search : in
biased statistics
  آمار ِ ورکدار   
âmâr-e varakdâr

Fr.: statistique biasée   

A statistics based on a → biased sample.

biased; → statistics.

biaxial crystal
  بلور ِ دو‌آسه   
bolur-e doâsé

Fr.: cristal biaxe   

A birefrigent crystal, such as mica, that is characterized by having two optical axes along which light is propagated with equal velocities.

Biaxial, from → bi- "two" + axial, from → axe; → crystal.

BICEP2
     
BICEP2

Fr.: BICEP2   

A → microwave → polarimeter designed specifically to target the → B-mode signature of → inflation in the → cosmic microwave background polarization. BICEP2 observed from the South Pole for three seasons from 2010 to 2012. This 26 cm aperture → telescope comprised an all-cold refracting optical system equipped with a → bolometer array of 512 → detectors (256 pixels) operating at 150 GHz.

BICEP2, the upgraded version of the first BICEP, short for Background Imaging of Cosmic Extragalactic Polarization.

biconcave lens
  عدسی ِ دوکاو   
adasi-ye dokâv

Fr.: lentille biconcave   

Describing a lens with two concave faces.

bi-; → concave; → lens.

biconvex lens
  عدسی ِ دوکوژ   
adasi-ye dokuž

Fr.: lentille biconvexe   

A → spherical lens with two convex faces. The radii of curvature for the two surfaces may or may not be the same.

bi-; → convex; → lens.

Biela's comet
  دنباله‌دار ِ بیلا   
donbâledâr-e Biyelâ

Fr.: comète de Biela   

A comet having a short period of 6.62 years discovered by Biela. It broke up on its 1846 return and subsequently gave rise to a spectacular meteor shower.

In honor of Wilhelm von Biela (1782-1856), Austrian military officer and amateur astronomer, who re-discovered the comet Biela in 1826, although it had been seen first in 1772. → comet.

Bielids
  بیلاییان   
Bielâyiân

Fr.: Bielides   

A → meteor shower, originating from → Biela's comet, whose → radiant lies in the constellation → Andromeda; also called → Andromidids.

Bielids, From Biel(a) + → -ids suffix denoting "descendant of, belonging to the family of."

bifurcate
  ۱) دوگلیدن؛ ۲) دوگل   
1) dogalidan; 2) dogal

Fr.: 1) bifurquer; 2) à deux branches   

1) To divide into two branches.
2) Divided into two branches.

M.L. bifurcatus, from L. → bi- "two," + furca "pitchfork; fork used in cooking," of uncertain origin.

Dogalidan, from Gilaki dogal "fork, two-branched," cf. Tabari dekal, dokkal, doqâla, from do, → two, + gal, kal "branch, part," cf. Kurd. (Kurmanji) kar "part, piece," cognate with Pers. kârd "knife," (+ *niš-) nišgarda "cobbler's knife;" Mid.Pers. kârt "knife," karēnītan, karītan "to cut," (+ *fra-) fragard "chapter, section;" Av. karət- "to cut;" Proto-Iranian *kart- "to cut;" cf. Skt. kart- "to cut;" Gk. karpos "fruit;" L. carpere "to cut, divide, pluck;" PIE base *(s)ker- "to cut;" + -idan infinitive suffix. See also → shear.

bifurcation
  دوگلش   
dogaleš

Fr.: bifurcation   

1) A branching or division into two parts; a splitting apart.
2) A sudden qualitative change in the behavior of a → dynamical system. The equation describing the evolution of the system finds several solutions for certain values of a parameter. Systems undergoing a bifurcation do not necessarily return to their original state, even if the parameter returns to its nominal value. See also → chaos.

Verbal noun of → bifurcate.

bifurcation point
  نقطه‌ی ِ دوگلش   
noqte-ye dogaleš

Fr.: point de bifurcation   

The point or moment in the evolution of a → dynamical system that occurs if a parameter passes through a critical point. At this point the system branches into any number of qualitatively new types of behavior.

bifurcation; → point.

bifurcation theory
  نگره‌ی ِ دوگلش   
negare-ye dogaleš

Fr.: théorie de bifurcation   

1) A theory which studies how, in certain nonlinear systems, there may be paths and shifts in behavior dependent on small changes in circumstances or the current position of the system.
2) Math.: The study of the behavior of a solution of a nonlinear problem in the neighborhood of a known solution, particularly as a parameter varies.

bifurcation; → theory.

big
  بزرگ، مه   
bozorg (#), meh (#)

Fr.: grand, gros   

Of considerable size, number, quantity, large.

M.E., northern England dialect, of unknown origin.

Bozorg, → large. Meh "great, large;" Mid.Pers. meh, mas; Av. maz-, masan-, mazant- "great, important," mazan- "greatness, majesty," mazišta- "greatest;" cf. Skt. mah-, mahant-; Gk. megas; L. magnus; PIE *meg- "great."

Big Bang
  مه بانگ، بیگ بنگ   
Meh Bâng (#), Big Bang (#)

Fr.: Big Bang   

A theory which states that the → Universe came into existence in an "instantaneous" event some 14 billion years ago. Matter was created in that initial event and as time has gone by the Universe has expanded and the contents evolved into the galaxies and stars and of today. The Big Bang is sometimes described as an "explosion." However, matter and energy did not erupt into a pre-existing space, since they came into being simultaneously with space and time.

big; bang "a sudden loud noise, as of an explosion" (probably of Scandinavian origin; akin to Icelandic banga "to hammer"). The term was coined by Fred Hoyle in 1950 in the course of discussions entitled "the Nature of the Universe" broadcasted by BBC. Hoyle's intention was a pejorative term in order to ridicule the theory which his own → steady state theory contested.

Meh Bâng, from meh "great, large," → big, + bâng "voice, sound, clamour," (Mid.Pers. vâng, Av. vaocanghê "to declare (by means of speech"), vacah- "word," from vac- "to speak, say," cf. Mod.Pers. vâžé "word," âvâz "voice, sound, song," Skt. vakti "speaks, says," vacas- "word;" Gk. epos "word," L. vox "voice;" PIE base *wek- "to speak").

Big Bang model
  مدل ِ مه بانگ، ~ بیگ بنگ   
model-e Meh Bâng, ~ Big Bang

Fr.: modèle du big bang   

Big Bang; → model.

Big Bang nucleosynthesis (BBN)
  هسته‌هندایش ِ مهبانگ، ~ بیگ بنگ   
haste-handâyeš-e Meh Bâng, ~ Big Bang

Fr.: nucléosynthèse de Big Bang   

The production of → light elements, roughly three minutes after the → Big Bang when the temperature of the → Universe dropped from 1032 K to approximately 109 K. In a short time interval → protons and → neutrons collided to produce → deuterium. Most of the deuterium then fused with other protons and neutrons to produce → helium and a small amount of → tritium. The element → lithium 7 could also arise form the coalescence of one tritium and two deuterium nuclei. According to the Big Bang nucleosynthesis theory, roughly 25% of the mass of the Universe consists of helium. It also predicts about 0.01% deuterium, and even smaller quantities of lithium. These predictions depend critically on the → baryon-photon ratio. Same as → primordial nucleosynthesis.

Big Bang; → nucleosynthesis.

Big Bang singularity
  تکینی ِ بیگ بنگ   
takini-ye Big Bang

Fr.: singularité du Big Bang   

A hypothetical state of → infinite energy density representing an infinite → gravitational field and infinite → space-time curvature. The singularity arises from using Einstein's theory of → general relativity concerning gravity. We know, however, that when the density and heat become extremely large, quantum physics of gravity becomes important. Yet Einstein's equations ignore quantum effects. In other words, in certain extreme conditions, Einstein's equations do not apply.

Big Bang; → singularity.

Big Bang theory
  نگره‌ی ِ مه بانگ، ~ بیگ بنگ   
negare-ye Meh Bâng, ~ Big Bang

Fr.: théorie du big bang   

Big Bang; → theory.

big blue bump
  قوز ِ آبی ِ بزرگ   
quz-e âbi-ye bozorg

Fr.: grande bosse bleue   

The broad continuum feature dominating the optical-ultraviolet spectra of AGNs. Most current models attribute the big blue bump to thermal emission from an optically thick accretion disk.

big; → blue; bump, → bump Cepheid.

Big Crunch
  مه رمب، رمبش ِ فرجامین   
Meh Romb, rombeš-e farjâmin

Fr.: big crunch   

The state of extremely high density and temperature into which a closed → Universe would → collapse in the distant future. If the Universe has a mass density exceeding the critical threshold, then gravity will eventually halt the expansion and cause the Big Crunch.

big; crunch "to crush, grind, or tread noisily; the act or sound of crunching," alteration of craunch, possibly of imitative origin.

Meh "large, big," → big; romb, → collapse, from rombidan "to collapse;" rombeš-e farjâmin "final collapase," from rombeš verbal noun of rombidan; farjâmin, → late.

Big Dipper
  هفت برادران، هفتورنگ، چمچه‌ی ِ بزرگ   
haft barâdarân (#), haftowrang (#), camce-ye bozorg (#)

Fr.: Grand Chariot   

A group of seven stars, an → asterism, lying inside the Northern constellation → Ursa Major. They are: → Dubhe, → Merak, → Phad, → Megrez, → Alioth, → Mizar, and → Alkaid. The group is also known as the Plough in Great Britain.

big; dipper a popular U.S. name for the asterism known in Britain as The Plough or Charles' Wain, from dip O.E. dyppan "immerse," from P.Gmc. *dupjanan.

Haft barâdarân "the seven brothers," from haft "seven" (Mid.Pers. haft, Av. hapta, cf. Skt. sapta, Gk. hepta, L. septem, P.Gmc. *sebun, Du. zeven, O.H.G. sibun, Ger. sieben, E. seven; PIE *septm) + barâdarân, plural of barâdar "brother" (Mid.Pers. brad, bardar, O.Pers./Av. brātar-, cf. Skt. bhrátar-, Gk. phrater, L. frater, P.Gmc. *brothar; PIE base *bhrater- "brother").
Haftowrang, Mid.Pers. haptôiring, from Av. haptôiringa- "with seven marks," from hapto- "seven,"as above, + iringa- "mark," cf. Skt. linga- "mark, token, sign."
Camcé "a spoon, ladle; a wooden bowl or cup;" bozorg "big, large."

<< < -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 > >>