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 -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit 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 con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg 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 Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad 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 Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>

Number of Results: 13048 Search : far
blue loop
  گردال ِ آبی   
gerdâl-e âbi

Fr.: boucle bleue   

An evolutionary behavior of certain stars, particularly massive stars, which return to the blue stage after becoming a red supergiant. The phenomenon appears as a blueward loop on the theoretical evolutionary tracks.

blue; → loop.

Gerdâl, → loop, âbi, → blue.

blue Moon
  ماه ِ آبی   
mâh-e âbi

Fr.: lune bleue   

The second full moon in a calendar month. For a blue moon to occur, the first of the full moons must appear at or near the beginning of the month so that the second will fall within the same month. Full moons are separated by 29 days, while most months are 30 or 31 days long; so it is possible to fit two full moons in a single month. This happens every two and a half years, on average.

The folkloric term blue Moon for the calendrical event is new, and apparently goes back to the Maine Farmers' Almanac for 1937. But its original meaning in that work was the third full Moon in a season when there were four full Moons in that season. Some have related the term to the much older English expression moon is blue, which goes back to a couplet from 1528, interpreting it as "something that occurs rarely." However in that poem the expression had a meaning of "something that was absurd." Alternatively, the term blue Moon may have been borrowed from the Chinese lunar calendar particularly in its usage among American Chinese community. In fact in that calendar when there are two full Moons in a month they use the term "blue Moon" and add a thirteenth intercalary month. → blue; → moon.

blue region
  ناحیه‌ی ِ آبی   
nâhiye-ye âbi

Fr.: région bleue   

The portion of the → visible spectrum lying between 455 and 492 nm.

blue; → region.

blue sky
  آسمان ِ آبی   
âsmân-e âbi (#)

Fr.: ciel bleu   

A phenomenon which results from → Rayleigh scattering of sunlight by → atmospheric molecules. → Nitrogen and → oxygen molecules that compose about 78% and 21% of the air, respectively, are small compared to the light → wavelengths, and thus more effective at scattering shorter wavelengths of light (blue and violet). The → selective scattering by these → molecules is responsible for producing the blue skies on a clear sunny day. The sky over the horizon appears much paler in color, because the scattered blue light must pass through more air. Some of it gets scattered away again in other directions. Hence, less blue light reaches the observer's eyes.

blue; → sky.

blue straggler
  ویلان ِ آبی   
veylân-e âbi

Fr.: traînarde bleue, traînard bleu   

Any of stars, often found in → globular clusters and old → open clusters, that lie on the blueward extension of the → main sequence beyond the → turnoff point. Blue stragglers have an anomalously blue color and high luminosity in comparison with other cluster members. The most probable ways in which they could form are: → mass transfer or → coalescence in → close binary systems, encounters or collisions in overcrowded cores of globular clusters.

blue; → straggler.

blue supergiant
  ابرغول ِ آبی   
abarqul-e âbi

Fr.: supergéante bleue   

An evolved star of spectral type O, B, or A; e.g. → Rigel, → Deneb.

blue; → supergiant.

blue wing
  بال ِ آبی   
bâl-e âbi

Fr.: aile bleue   

The → line wing with wavelengths shorter than that of the emission or absorption peak.

blue; → wing.

blueberry
  آبی‌پلار   
âbipelâr

Fr.: myrtille, bleuet   

The edible, usually blueish berry of various shrubs belonging to the genus Vaccinium, of the heath family (TheFreeDictionary).

blue; → berry.

Blueberry galaxy
  کهکشان ِ آبی‌پلار   
kahkešân-e âbipelâr

Fr.: galaxie myrtille, ~ bleuet   

A galaxy having a very small size (< 1 kpc), very low stellar mass (typically 106.5 to 107.5  Msun), very low gas → metallicity (3 to 10% solar → metallicity, and very high → ionization. Blueberry galaxies, compared to star forming → dwarf galaxies, have similar stellar mass and luminosity, but much stronger → [O III] doublet (λλ4959+5007) line strength and gas ionization. Because Blueberry galaxies are selected by the strong [O III] → emission lines, they represent the star-forming → dwarf galaxies with the highest emission line strength and gas ionization. On the other hand, compared to → Green Pea galaxies at → redshifts z ~ 0.2-0.3 and typical high-zLyman alpha emitting galaxies (LAEs) found in the current narrow-band surveys, Blueberry galaxies have similarly strong emission lines but about 10-100 times smaller stellar mass, → star formation rate, and luminosity. So Blueberry galaxies represent the faint-end of → Green Pea galaxies and → Lyman alpha emitting galaxies (Yang et al, 2017, arxiv/1706.02819, and references therein).

blueberry; → galaxy.

blueshift
  آبی-کیب   
âbikib

Fr.: décalage vers le bleu   

The apparent shift of the wavelength towards the shorter wavelength region of the radiation spectrum of an approaching object due to the Doppler effect.

blue; → shift.

blueshifted component
  همنه‌ی ِ آبی-کیب   
hamneye âbikib

Fr.: composante décalée vers le bleu   

A constituent of a composite astronomical object which has a motion directed towards the observer, as revealed by its spectrum.

blueshift; → component.

blur
  ۱) تار کردن، ۲) تار شدن   

Fr.: estomper   

1) (v.tr.) To make indistinct and hazy in outline or appearance.
2) (v.intr.) To become indistinct.

Probably akin to M.E. bleren "to blear."

Târ "dark, obscure, cloudy" Mid.Pers. târ, from Mid./Mod.Pers. târ "dark, obscure, cloudy."

blurred image
  وینه‌ی ِ تار، ~ ِ ناتیگ، تصویر ِ ~   
vine-ye târ, ~ nâtig, tasvir-e ~

Fr.: image estompée, ~ floue   

An image which is dim, indistinct, or vague in appearance, for instance when the optics is not well-focused or when the seeing is poor. The same as → unsharp image, contrary to → sharp image.

Blurred, p.p. of → blur; → image.

blurring
  تارشد   
târšod

Fr.: estompage   

In → galactic dynamics models, the → scattering of stars at radii substantially away from → corotation resonance, especially at the → Lindblad resonances, leading to a higher → eccentricity. The → spiral wave response of a → galactic disk to a co-orbiting mass → clump blurs the distinction between scattering by → spiral arms and by mass clumps. See also → churning (J. A. Sellwood & J. J. Binney, 2002, astro-ph/0203510 and references therein).

Verbal noun of → blur.

Boötes
  گاوران، گایار   
Gâvrân, Gâyâr

Fr.: Bouvier   

The Herdsman, the Ox Driver. A constellation in the northern hemisphere, at right ascension about 14h 30m, north declination about 30°. Its brightest star is → Arcturus. Abbreviation: Boo; genitive form: Boötis.

L. Boötes, from Gk. bootes "plowman," literally "ox-driver," from bootein "to plow," from bous "ox," from PIE *gwou- "ox, bull, cow;" compare with Av. gao-, gâuš "bull, cow, ox," Mod.Pers. gâv, Skt. gaus, Armenian kov, O.E. cu.

Gâvrân "ox-driver," from gâv "ox, cow" + rân "driver," from rândan "to drive."
Gâyâr, from Lori "bull driver, plower, plow man" (Tabari goyâr), from "bull, cow," variant of gâv, explained above, + -âr, either "driver", Av. ar- "to set in motion" (Skt. ir-, IER *er-), or IER *are- "to plow" (L. arare, Gk. aroun, O.C.S. orja, Lith. ariu, Goth. arjan, O.E. erian, Tokharian AB âre). Compare also with Gilaki urân " to plow," Qâeni ordu "plow".

Bode's law
  قانون ِ بوده   
qânun-e Bode

Fr.: loi de Bode   

Titius-Bode law.

body
  ۱) تن؛ ۲) جسم   
1) tan; 2) jesm (#)

Fr.: corps   

1) The physical structure of a human being or animal, including the bones, flesh, and organs.
2) Any material object characterized by its physical properties.

Body, from O.E. bodig "trunk, chest," related to O.H.G. botah, of unknown origin.

1) Tan, from Mid.Pers. tan "body, person;" O.Pers. tanūš "body," tanūm [acc.sg.] "(to) oneself;" Av. tanū- "body, person, self," tanūm [acc.sg.]; cf. Skt. tanūš- "body, self;" PIE base *ten-uh- "body."
2) Jesm, from Ar. jism "body, corps."

Boeshaar-Keenan classification
  رده‌بندی ِ بوسهار-کینان   
radebandi-ye Boeshaar-Keenan

Fr.: classification de Boeshaar-Keenan   

A system for the classification of → S-type stars. The system involves the designations of a C/O index and a temperature type. Moreover, when possible, it uses intensity estimates for → ZrO bands, the → TiO bands, the → Na I D-lines, the YO bands, and the Li I 6708 line.

Philip C. Keenan & Patricia C. Boeshaar, 1980, ApJS, 43, 379; → classification.

Bohr
  بؤر   
Bohr

Fr.: Bohr   

Niels Bohr (1885-1962), Danish physicist who made several important contributions to modern physics. He won the 1922 Nobel prize for physics in recognition of his work on the structure of atoms.

Bohr atom
  اتم ِ بؤر   
atom-e Bohr

Fr.: atome de Bohr   

The simplest model of an atom according to which electrons move around the central nucleus in circular, but well-defined, orbits. For more details see → Bohr model.

Bohr; → atom.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit 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 con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg 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 Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad 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 Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>