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: 13048 Search : far
least-squares fit
  سز ِ کوچکترین چاروش‌ها   
saz-e kucaktarin cârušhâ

Fr.: ajustement moindres carrées   

A fit through data points using least squares.

least squares; → fit.

leave
  ۱) پریژیدن؛ ۲) پریژ   
1) parižidan; 2) pariž

Fr.: 1) quitter; 2) congé, permission   

1a) Go away from.
1b) To let remain or have remaining behind after going, disappearing, ceasing, etc.
2a) Permission to be absent, as from work or military duty.
2b) The time this permission lasts (Dictionary.com).

M.E. leven, from O.E. laefan "to allow to remain in the same state or condition" (cf. O.Saxon farlebid "left over;" Ger. bleiben "to remain") ultimately from PIE *leip- "to stick, adhere;" also "fat," from which the cognates: Gk. lipos "fat;" O.E. lifer "liver," → life.

Parižidan, on the model of Sariqoli barēzj "leavings;" Yaghnobi piraxs- "to stay behind, remain;" ultimately from Proto-Ir. *apa-raic-, from *raic- "to abandon, leave;" cf. Av. raēc- "to leave, let" (Cheung 2006), → heritage.

Leavitt law
  قانون ِ لویت   
qânun-e Leavitt

Fr.: loi de Leavitt   

Same as the → period-luminosity relation.

Named after Henrietta Swan Leavitt (1868-1921), American woman astronomer, who discovered the relation between the luminosity and the period of → Cepheid variables (1912); → law.

Leclanché cell
  پیل ِ لوکلانشه   
pil-e Leclanché (#)

Fr.: pile de Leclanché   

A → primary cell in which the anode is a rod of carbon and the cathode a zinc rod both immersed in an electrolyte of ammonia plus a depolarizer.

Named after the inventor Georges Leclanché (1839-1882), a French chemist, → cell.

Leda
  لدا   
Ledâ (#)

Fr.: Léda   

1) The ninth of Jupiter's known satellites and the smallest. It is 16 km in diameter and has its orbit at 11 million km from its planet. Also called Jupiter XIII, it was discovered by Charles Kowal (1940-), an American astronomer, in 1974.
2) An asteroid, 38 Leda, discovered by J. Chacornac in 1856.

In Gk. mythology, Leda was queen of Sparta and the mother, by Zeus in the form of a swan, of Pollux and Helen of Troy.

Ledoux's criterion
  سنجیدار ِ لو‌دو   
sanjidâr-e Ledoux

Fr.: critère de Ledoux   

An improvement of → Schwarzschild's criterion for convective instability, which includes effects of chemical composition of the gas. In the Ledoux criterion the gradient due to different molecular weights is added to the adiabatic temperature gradient.

After the Belgian astrophysicist Paul Ledoux (1914-1988), who studied problems of stellar stability and variable stars. He was awarded the Eddington Medal of the Royal Astronomical Society in 1972 (Ledoux et al. 1961 ApJ 133, 184); → criterion.

left
  چپ   
cap (#)

Fr.: gauche   

Of, pertaining to, or located on or toward the west when somebody or something is facing north. Opposite of → right.

M.E. left, lift, luft, O.E. left, lyft- "weak, idle," cf. Ger. link, Du. linker "left," from O.H.G. slinc, M.Du. slink "left," Swed. linka "limp," slinka "dangle."

Cap "left," from unknown origin.

left-hand rule
  رزن ِ دست ِ چپ   
razan-e dast-e cap

Fr.: règle de la main gauche   

See → Fleming's rules.

left; → hand; → rule.

left-handed
  چپال، چپدست   
capâl (#) , capdast (#)

Fr.: gaucher   

Using the left hand with greater ease than the right.

left; → hand + -ed.

Capâl, from cap, → left, + -al, → -al. Capdast, with dast, → hand.

leg
  ۱) لنگ؛ ۲) ساق   
1) leng (#); 2) sâq (#)

Fr.: jambe   

1) The part of the body from the top of the → thigh down to the → foot.
2) Anatomy: The lower limb of a human being between the → knee and the → ankle.

M.E., from O.Norse leggr; cognate with Dan. læg, Swed. läg "the calf of the leg."

Leng, related to Mid.Pers. zang "shank, ankle;" Av. zanga-, zənga- "bone of the leg; ankle bone; ankle;" Skt. jánghā- "lower leg;" maybe somehow related to E. → shank.

legal
  قانونی   
qânuni (#)

Fr.: légal   

1) Permitted by law; lawful.
2) Of or relating to law; connected with the law or its administration (Dictionary.com).

From M.Fr. légal or directly from L. legalis "legal, pertaining to the law," from lex (genitive legis) "law."

Qânuni, of or relating to qânun, → law.

legend
  چیروک   
cirok

Fr.: légende   

1) A non-historical or unverifiable story handed down by tradition from earlier times and popularly accepted as historical.
2) The body of stories of this kind, especially as they relate to a particular people, group, or clan (Dictionary.com).

M.E. legende "written account of a saint's life," from O.Fr. legende and directly from M.L. legenda literally, "(things) to be read," noun use of feminine of L. legendus, gerund of legere "to read" (on certain days in church).

Cirok, from Kurd. cirok "story, fable," related to Kurd. cir-, cirin "to sing, [to recite?];" Av. kar- "to celebrate, praise;" Proto-Ir. *karH- "to praise, celebrate;" cf. Skt. kar- "to celebrate, praise;" O.Norse herma "report;" O.Prussian kirdit "to hear;" PIE *kerH2- "to celebrate" (Cheung 2007).

legendary
  چیروکی   
ciroki

Fr.: légendaire   

Of, relating to, or of the nature of a legend.

legend; → -ary.

Legendre equation
  هموگش ِ لوژاندر   
hamugeš-e Legendre

Fr.: équation de Legendre   

The → differential equation of the form: d/dx(1 - x2)dy/dx) + n(n + 1)y = 0. The general solution of the Legendre equation is given by y = c1Pn(x) + c2Qn(x), where Pn(x) are Legendre polynomials and Qn(x) are called Legendre functions of the second kind.

Named after Adrien-Marie Legendre (1752-1833), a French mathematician who made important contributions to statistics, number theory, abstract algebra, and mathematical analysis; → equation.

Legendre transformation
  ترادیسش ِ لوژاندر   
tarâdiseš-e Legendre

Fr.: transformation de Legendre   

A mathematical operation that transforms one function into another. Two differentiable functions f and g are said to be Legendre transforms of each other if their first derivatives are inverse functions of each other: df(x)/dx = (dg(x)/dx)-1. The functions f and g are said to be related by a Legendre transformation.

Legendre equation; → transformation.

legislation
  قانونگذاری   
gânungozâri (#)

Fr.: législation   

1) The act of making or enacting laws.
2) A law or a body of laws enacted (Dictionary.com).

From Fr. législation, from L.L. legislationem, from legis latio, "proposing (literally 'bearing') of a law," → legislator.

Qânungoz&acric;ri "act or process followed by the qânungoz&acric;r", → legislator.

legislator
  قانونگذار   
qânungozâr (#)

Fr.: législateur   

1) A person who gives or makes laws.
2) A member of a legislative body (Dictionary.com).

From L. legis lator "proposer of a law," from legis, genitive of lex, → law, + lator "proposer," agent noun of latus "borne, brought, carried."

Qânungozâr, literally "he who places the law," from qânun, → law, + gozâr, present stem and agent noun of gozâštan "to place, put; perform; allow, permit," related to gozaštan "to pass, to cross," → trans-

Lemaître Universe
  گیتی ِ لومتر   
giti-ye Lemaître (#)

Fr.: Univers de Lemaître   

A cosmological hypothesis, based on Einstein's relativity, in which the expanding Universe began from an exploding "primeval atom." In the Lemaître Universe the rate of expansion steadily decreases.

Named after Monsignor Georges Edouard Lemaître (1894-1966), a Belgian Roman Catholic priest, honorary prelate, professor of physics and astronomer; → universe.

lemma
  نهک   
nehak

Fr.: lemme   

1) A subsidiary proposition, proved for use in the proof of another proposition.
2) Linguistics: A word considered as its citation form together with all the → inflected forms. For example, the lemma go consists of go together with goes, going, went, and gone.
3) An argument or theme, especially when used as the subject or title of a composition (Dictionary.com).

From L. lemma, from Gk. lemma "something received or taken; an argument; something taken for granted," from root of lambanein "to take," → analemma.

Nehak, from neh present stem of nehâdan "to place, put; to set," → position, + -ak a diminutive suffix of nouns.

lemniscate of Bernoulli
  لمنیسکات ِ برنویی   
lemniskât-e Bernoulli

Fr.: lemniscate de Bernoulli   

A closed curve with two loops resembling a figure 8. It is represented by the Cartesian equation (x2 + y2)2 = a2(x2 - y2), where a is the greatest distance from the origin (pole) to the curve. Its polar equation is r2 = a2 cos 2θ.

From L. Latin lemniscatus "adorned with ribbons," from lemniscus "a pendent ribbon," from Gk. lemniskos "ribbon;" First described by Jacques Bernoulli (1654-1705) in 1694.

<< < -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 > >>