An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>

Number of Results: 12948 Search : far
alternation
  پیوارش   
peyvâreš

Fr.: alternance   

General: Successive change from one thing or state to another and back again.
The process of periodically varying a voltage from zero to a maximum, back to zero, to a minimum, and then to zero.

Alternation, noun from → alternate.

alternative
  دگرینه   
degarine

Fr.: alternatif   

1) (n) A proposition or situation offering a choice between two or more things only one of which may be chosen.
2) (adj) Offering or expressing a choice. → alternative energy, → alternatively.

Alternative, from → alternate.

Degarine, from degar "other," variant digar, from Mid.Pers. dit, ditikar "the other, the second," O.Pers. duvitiya- "second," Av. daibitya-, bitya- "second," Skt. dvitiya- "second," PIE *duitiio- "second" + suffix -ine.

alternative energy
  کاروژ ِ دگرینه   
kâruž-e degarine-ye

Fr.: énergie alternative   

Energy from a source other than the conventional fossil fuel sources.

alternative; → energy.

alternative hypothesis
  انگاره‌ی ِ دگرینه   
engâre-ye degarine

Fr.: hypothèse alternative   

Statistics: In → significance testing, any hypothesis which differs from the one being tested. A hypothesis alternative to the → null hypothesis is denoted by H1.

alternative; → hypothesis.

alternatively
  دگرینانه   
degarinâné

Fr.: alternativement   

In place of, or as an alternative to.

Adverb from → alternative.

alternator
  پیوارگر   
peyvârgar

Fr.: alternateur   

A machine or device that produces alternating current.

Alternator, noun from → alternate + → -or.

altimeter
  فرازسنج، فرازیاب   
farâzsanj (#), farâzyâb (#)

Fr.: altimètre   

An instrument which determines the altitude of an object with respect to a fixed level, such as sea level.

L. altus "high" + → -meter.

Farâzsanj, from farâz "above, over, aloft" + -sanj, → -meter; farâzyâb, from farâz + yâb "finder," from yâbidan "to find, discover, obtain."

altimetry
  فرازسنجی، فرازیابی   
farâzsanji (#), farâzyâbi (#)

Fr.: altimétrie   

The measurement of heights in the atmosphere (altitude) by an → altimeter.

altimeter; → -metry.

altitude
  فرازا   
farâzâ (#)

Fr.: altitude   

1) The height above sea level.
2) The angle between an object's position on the celestial sphere and the horizon.
3) Of a triangle, the perpendicular from the base to the opposite vertex.

Altitude, from L. altitudo, from altus "high".

Farâzâ, from farâz "above, up, upon," → height, + noun making suffix -a.

altitude circle
  پرهون ِ فرازا   
parhun-e farâzâ

Fr.: cercle d'égale altitude   

A circle on the celestial sphere that has equal altitude over the Earth's surface and lies parallel to the horizon. Also called almucantar, circle of altitude, parallel of altitude.

altitude; → circle.

altitude-azimuth mounting
  برنشاند ِ فرازا-سوگان   
barnešând-e farâzâ-sugân

Fr.: monture altitude-azimutale   

Same as → altazimuth mounting.

altitude; → azimuth; → mounting.

aluminium
  آلومینیوم   
âluminiom (#)

Fr.: aluminium   

A silver-white, malleable and ductile metal, symbol Al. → Atomic number 13; → atomic weight 26.98154; → melting point 660.37°C; → boiling point 2,467°C; → specific gravity 2.6989 at 20°C. Its electric → conductivity is comparable with that of copper, so that being much lighter it is used extensively for transmission lines. The metal and its → alloys have strength with lightness. The → reflectivity of aluminium is high and it is therefore used broadly for coating → mirrors (→ aluminization). Aluminium occurs widely in clays; it is extracted mainly from bauxite. It has several → radioactive isotopes with half-lives from 2.3 sec (23Al) to 6.56 min (29Al). When aluminium is bombarded with → alpha particles, its atoms first turn into radioactive → phosphorus, then into → silicon. This occurs naturally in → massive stars.

The name of the chemical element, was coined by Sir Humphry Davy (1778-1829), from L. alumen "alum; bitter salt," akin to Gk. aludoimos "bitter" and Eng. ale. Davy originally called it alumium (1808), then modified this to aluminum, which remains the U.S. word, but British editors in 1812 further amended it to aluminium. In 1825, the Danish physicist Hans Christian Oersted (1777-1851) isolated impure aluminium. The pure metal was first isolated by the German chemist Friedrich Wöhler (1800-1882) in 1827.

aluminize
  آلومینیوم اندودن   
âluminiom andudan (#)

Fr.: aluminiser   

To coat a telescope → mirror with a very thin but perfectly uniform layer of → aluminium to make it reflective.

Aluminize, v. from alumin(um), → aluminium, + → -ize.

Âluminiom andudan, from âluminiom + andudan "to incrustate, plaster, cover over."

aluminizing, aluminization
  آلومینیوم اندود   
âluminiom andud (#)

Fr.: aluminisation   

The process by which the coating of aluminium is deposited on a telescope mirror.

Verbal noun of → aluminize.

AM CVn star
  ستاره‌ی ِ AM سگان ِ تازی   
setâre-ye AM Sagân-e Tâzi

Fr.: étoile AM CVn   

A → binary system that has very short orbital period (less than one hour) and helium dominated spectrum. The prototype, AM Canum Venaticorum, with a period of 17 minutes, was discovered in 1967. AM CVn stars are → semidetached binary systems in which → accretion is going on. The → donor star is hydrogen deficient and the → accretor is usually a → white dwarf. To fit within their → Roche lobes, the donor stars must be dense, suggesting they may be → degenerate too. It is at present thought that AM CVn stars represent three possible evolutionary phases in 1) → double white dwarf systems, 2) white dwarf and → helium star binaries, and 3) → cataclysmic variables with evolved donors. For a review see G. Nelemans 2005, astro-ph/0409676.

AM, letters of alphabet used in variable star designations; CVn, abbreviation of → Canes Venatici; → star.

AM Herculis
   AM هراکلس   
AM Herâkles

Fr.: AM Herculis   

A → red dwarf variable star located in the constellation → Hercules. AM Herculis usually remains in its "high" state (V ~ 13 mag), but from time to time it drops into a "low" state (V> 15 mag) that may last weeks or months. Originally classified as an irregular variable and associated with the X-ray source 3U 1809+50, AM Her was discovered in 1976 to be a short-period → binary system (3.1 hour orbital period) related to the → cataclysmic variables. It is in fact an → interacting binary in which a red dwarf (M4 V) loses mass to a → white dwarf primary star. The white dwarf has a very strong magnetic field (B ~ 2 × 108 G) and rotates synchronously with the orbit. The magnetic field constrains the → mass loss from the secondary star to flow along a stream directly onto the white dwarf rather than into an → accretion disk as in the nonmagnetic cataclysmic variables. The optical spectrum shows strong emission lines of H, He I, and He II, along with weaker lines of other ions such as N III, C III, C II, and Ca II, all showing large velocity variations. → TiO bands from the M4 V secondary star are detected when the system is in its "low" state. AM Her is the class prototype of the → polars (see, e.g., Hutchings et al. 2002, AJ 123, 2841).

AM, letters of alphabet used in variable star designations; → Hercules.

Am star
  ستاره‌ی ِ Am   
setâre-ye Am

Fr.: étoile Am   

A chemically peculiar A- or early F-type star showing an overabundance of → heavy elements and an underabundance of calcium and scandium. An Am star cannot receive a unique spectral type, as different methods (using the metallic lines, the hydrogen Balmer lines, and the calcium Ca II K-lines) yield three different spectral types. Contrarily to Ap stars, Am stars do not have significant external magnetic fields. Their rotational velocities are about 100-120 km s-1 smaller than those of → Ap stars.

A for the spectral type, m for → metal; → star.

Amalthea [Jupiter V]
  آمالتیءا   
Âmâlteâ (#)

Fr.: Amalthée   

The third of Jupiter's known satellites orbiting at about 181,300 km from Jupiter with a period of about 12h. A mean diameter of 189 km makes it the fifth largest satellite of Jupiter. Amalthea was discovered by E. Barnard in 1892.

Amalthea, in Gk. mythology, the goat that suckled Zeus after his mother had him sent to Crete so his father would not eat him.

amass
  انباشتن   
anbâštan (#)

Fr.: amasser   

1) To collect into a mass or pile; → accumulate.
2) To gather for oneself; collect as one's own (Dictionary.com).

M.E., from O.Fr. amasser, from à "to," → ad-, + masser "to gather in mass," → mass.

Anbâštan, anbârdan "to fill, to replete," from Mid.Pers. hambāridan "to fill;" from Proto-Iranian *ham-par-, from prefix ham-, → com-, + par- "to fill;" cf. Av. par- "to fill," parav-, pauru-, pouru- "full, much, many;" O.Pers. paru- "much, many;" Mid.Pers. purr "full;" Mod.Pers. por "full, much, very;" PIE base *pelu- "full," from *pel- "to be full;" cf. Skt. puru- "much, abundant;" Gk. polus "many," plethos "great number, multitude;" O.E. full.

amateur
  دوستکار   
dustkâr (#)

Fr.: amateur   

One who engages in an activity (study, science, or sport) as a pastime rather than as a profession. → amateur astronomer, → amateur astronomy.

From Fr. amateur "lover of, one who has a taste for (something)," from L. amator "lover," from amare "to love."

Dustkâr, a variant of dustâr, dustdâr "he who likes, lover, supporter," from dust "friend, lover" + kâr "occupation, → work."

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>