# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 662
 intuitive   درگسی   dargasiFr.: intuitif   Known or perceived by → intuition. See also → intuitionism.→ intuition; → -ive. invalid   ناپای‌مند   nâpâymandFr.: invalide   Logic: The quality of an argument when its conclusion is false even if all the premises are true.→ in-; → valid. invalidity   ناپای‌مندی   nâpâymandiFr.: invalidité   Lack of → validity.→ invalid; → -ity. invariable plane   هامُن ِ ناورتنده   hâmon-e nâvartandéFr.: 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   nâvartâyiFr.: 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   nâvartâFr.: 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   parâvidanFr.: 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   parâvešFr.: invention   The action or of inventing or something invented.Verbal noun of → invent. inventor   پراونده، پراوگر   parâvandé, parâvgarFr.: 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 vârunFr.: 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 vârunFr.: Bremsstrahlung inverse   The absorption of a photon by an electron in a strong electric field. → bremsstrahlung. inverse Compton effect   ا ُسکر ِ کامپتون ِ وارون   oskar-e Compton-e vârunFr.: 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 P Cygni line profile   فراپال ِ P Cygniی ِ وارون   farâpâl-e P Cygni-ye vârunFr.: 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 vârunFr.: 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 vârunFr.: 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, vârunešFr.: 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 vâgardâniFr.: 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, vârunidanFr.: 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.