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
invalidity
  ناپای‌مندی   
nâpâymandi

Fr.: invalidité   

Lack of → validity.

invalid; → -ity.

invariable plane
  هامُن ِ ناورتنده   
hâmon-e nâvartandé

Fr.: plan invariable   

Mechanics: For a rotating rigid body not subject to external torque, a plane which is perpendicular to the angular momentum vector of the body, and which is always tangent to its → inertia ellipsoid.

Invariable negation of → variable; → plane.

invariance
  ناورتایی   
nâvartâyi

Fr.: invariance   

Any property of a physical law or quantity that is unchanged after the application of certain classes of transformations.

Invariance; noun of → invariant.

invariant
  ناورتا   
nâvartâ

Fr.: invariant   

A quantity which is independent of the coordinate system. For example the vector product of two vectors is an invariant since it depends only on the magnitude of the two vectors and the angle between them.

From negation prefix → in- + variant, from L. variantem (nom. varians), pr.p. of variare "to change," from varius "varied, different, spotted."

Nâvartâ, from negation prefix nâ-, → in-, + vartâ adj., from vartidan, variant of gardidan, gaštan "to change; to turn," Mid.Pers. vartitan; Av. varət- "to turn, revolve;" cf. Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" L. vertere "to turn;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend."

invent
  پراویدن   
parâvidan

Fr.: inventer   

To create or design a new type of thing (process, machines, etc.). See also → discover.

From L. inventus, p.p. of invenire "to encounter, come upon, find," from in- "upon" + ven-, from venire "to come" + -tus p.p. suffix.

Parâvidan on the model of dialectals Munji purôv-/purvi-, Yidgha pura-/prvei- "to find, obtain," Shughni, Roshani, Bartangi, Yazghulami firâp-fiript "to arrive at, reach;" prefixed (*fra-/*pra-) from Proto-Iranian *Hap/f- "to reach, attain;" cf. Av. ap- "to reach, attain;" related to Pers. yâb-, yâftan "to find" (Cheung 2007).

invention
  پراوش   
parâveš

Fr.: invention   

The action or of inventing or something invented.

Verbal noun of → invent.

inventor
  پراونده، پراوگر   
parâvandé, parâvgar

Fr.: inventeur   

A person who invents.

invent + → -or.

inverse
  وارون   
vârun (#)

Fr.: inverse   

Opposite to or reversing something.
Math.: Involving two variables that are in a mathematical relationship where, when one increases, the other decreases and vice versa.

From L. inversus, p.p. of invertere, → invert.

Vârun "inverse, upside down," from vâ- "back, backward, again, re-," variant of bâz-, from Mid.Pers. abâz-, apâc-, O.Pers. apa- [pref.] "away, from;" Av. apa- [pref.] "away, from," apaš [adv.] "toward the back;" cf. Skt. ápāñc "situated behind."

inverse axiom
  بنداشت ِ وارون   
bondâšt-e vârun

Fr.: axiome d'inverse   

A basic rule in → group theory stating that for any element a of a group there is an element a-1 such that a * a-1 = a-1 * a = e.

inverse; → axiom.

inverse beta decay
  تباهی ِ وارون ِ بتا   
tabâhi-ye vârun-e β (#)

Fr.: désintégration β inverse   

A collision of a proton with an electron that produces a neutron and an electron neutrino. See → beta decay.

inverse; β, letter of Gk. alphabet; → decay.

inverse bremsstrahlung
  لگام-تابش ِ وارون   
legâm-tâbeš-e vârun

Fr.: Bremsstrahlung inverse   

The absorption of a photon by an electron in a strong electric field. → bremsstrahlung.

inverse; → bremsstrahlung.

inverse Compton effect
  ا ُسکر ِ کامپتون ِ وارون   
oskar-e Compton-e vârun

Fr.: effet Compton inverse   

A → scattering process by which fast-moving, energetic particles transfer energy to photons, decreasing the wavelength of the radiation. This is a particularly important effect in astrophysics and cosmology since it explains the → Sunyaev-Zel'dovich effect.

inverse; → Compton effect.

inverse P Cygni line profile
  فراپال ِ P Cygniی ِ وارون   
farâpâl-e P Cygni-ye vârun

Fr.: profil P Cygni inverse   

A line profile in which the emission is on the blue side of the absorption. It is usually interpreted as the redshift of the absorption component relative to emission lines, which necessitates infall of matter.

inverse; → P Cygni; → line; → profile.

inverse square law
  قانون ِ توان ِ دوی ِ وارون، قانون ِ چاروش ِ وارون   
qânun-e tavân-e do-ye vârun, qânun-e câruš-e vârun

Fr.: loi en carré inverse   

A force law that applies to the → gravitational and → electromagnetic forces in which the magnitude of the force decreases in proportion to the inverse of the square of the → distance.

inverse; → square; → law.

inverse Zeeman effect
  اُسکر ِ زیمن ِ وارون   
oskar-e Zeeman-e vârun

Fr.: effet Zeeman inverse   

The → Zeeman effect obtained in absorption. The phenomenon is observed by sending white light through an absorbing vapor when the latter is subjected to a uniform magnetic field. The laws governing the inverse effect are similar to those for the direct effect.

inverse; → Zeeman effect.

inversion
  واگردانی، وارونش   
vâgardâni, vâruneš

Fr.: inversion   

Meteo.: A departure from the usual decrease or increase with altitude of the value of an atmospheric property. It almost always refers to a temperature inversion, i.e., an increase in temperature with altitude. Chemistry: To subject to → inversion.

Verbal noun of → invert.

inversion layer
  لایه‌ی ِ واگردانی   
lâye-ye vâgardâni

Fr.: couche d'inversion   

Meteo.: The atmospheric layer in which the temperature gradient is inverted, that is increases; → inversion. The inversion layer tends to prevent the air below it from rising, thus trapping any pollutants that are present.
Electricity: A converting of direct current into alternating current.

inversion; → layer.

invert
  واگرداندن، وارونیدن   
vâgardândan, vârunidan

Fr.: inververtir, renverser   

To turn upside down.
To reverse in position, order, direction, or relationship. → inversion layer.

From M.Fr. invertir, from L. invertere "turn upside down, turn about," from → in- "in, on" + vertere "to turn;" cf. Pers. gardidan, gaštan "to turn, to change;" Mid.Pers. vartitan; Av. varət- "to turn, revolve;" Skt. vartati; O.H.G. werden "to become;" PIE base *wer- "to turn, bend."

Vâgardândan, from vâ-, → re-, + gardândan, from gardidan "to turn; to change," from Mid.Pers. vartitan; Av. varət- "to turn, revolve;" cf. Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" L. vertere "to turn;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend."
Vârunidan, infinitive of vârun, → inverse.

inverted population
  پرینش ِ واگردانیده، ~ وارون   
porineš-e vâgardânidé, ~ vârun

Fr.: population inversée   

In atomic physics, a condition in which there are more electrons in an upper energy level than in a lower one, while under normal conditions of thermal equilibrium the reverse is true. → optical pumping.

Inverted, p.p. of → invert; → population.

inviscid
  ناوشکسان   
nâvošksân

Fr.: non visqueux   

Fluid mechanics: Having no → viscosity. Same as → nonviscous.

From → in- "non-" + viscid, from L.L. viscidus, from vis(cum) "anything sticky, mistletoe," → viscous, + -idus.

<< < -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 > >>