# 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: 716
 distribution function   کریای ِ واباژش   karyâ-ye vâbâžešFr.: fonction de distribution   A function that gives the relative frequency with which the value of a statistical variable may be expected to lie within any specified interval. For example, the Maxwellian distribution of velocities gives the number of particles, in different velocity intervals, in a unit volume.→ distribution; → function. distributive   واباژشی   vâbâžešiFr.: distributif   Characterized by or relating to → distribution. → distributive law.→ distibution; → -ive. distributive law   قانون ِ واباژش   qânun-e vâbâžšFr.: loi distributive   Math.: In multiplication, the principle that permits the multiplier to be applied separately to each term in the multiplicand: x(y + z) = xy + xz. → associative law; → commutative law.→ distributive; → law. distributivity   واباژندگی   vâbâžandegiFr.: distributivité   The state or quality of being distributive.Noun of → distributive. disturb   پریشاندن   parišândan (#)Fr.: déranger, perturber   1) To interfere with; interrupt; hinder. 2) To interfere with the arrangement, order, or harmony of; disarrange (Dictionary.com).M.E., from O.Fr. destorber, from L. disturbare "to throw into disorder," from → dis- "completely" + turbare "to disorder, disturb," from turba "turmoil," → turbid.Parišândan, infinitive from parišân "dispersed, scattered," also parišidan "to disperse, get disturbed," ultimately from Proto-Ir. *parišan- literally "disperse around," from *pari-, Pers. par-, pirâ-, → peri-, + *šan- "to shake;" cf. afšândan, → volcano; Choresmian šny- "to tremble;" Zazaki šânâyiš/šânen- "to shake, scatter;" Kurd râšândin "to spread;" Tabari šanne "he shakes" (Cheung 2007). disturbance   پریشانش   parišânešFr.: dérangement, perturbation   The act of disturbing. The state of being disturbed.Verbal noun of → disturb. diurnal   روزانه   ruzâné (#)Fr.: diurne   Having a period of, occurring in, or related to a → day.L.L. diurnalis, from V.L. diurnum "day" (Fr. jour), from L. diurnus "daily," from dies "day" + -urnus, an adj. suffix denoting time. Dies "day" from PIE base *dyeu- "to shine;" cf. Gk. delos "clear;" L. deus; Skt. deva "god;" Mod.Pers. div "devil, demon;" O.Pers. daiva- "evil god, demon;" Av. daēva- "evil spirit, false god;" Gk. Zeus "supreme god."Ruzâné, from ruz→ day + -âné a suffix forming adverbs and adjectives. diurnal aberration   بیراهش ِ روزانه   birâheš-e ruzânéFr.: aberration diurne   The aberration of a star's position due to the rotation of the Earth. Its value depends on the latitude of the observer, and is only 0''.32 in the case of an observer at the equator, where the rotational velocity is greatest.→ diurnal; → aberration. diurnal circle   پرهون ِ روزانه، دایره‌ی ِ ~   parhun-e ruzâné, dâyere-ye ~Fr.: cercle diurne   The apparent path of an object in the sky during one day, due to Earth's rotation.→ diurnal; → circle. diurnal motion   جنبش ِ روزانه   jonbeš-e ruzânéFr.: mouvement diurne   The daily apparent motion of all celestial objects, due to Earth's rotation.→ diurnal; → motion. diurnal parallax   دیدگشت ِ روزانه   didgašt-e ruzânéFr.: parallaxe diurne   The apparent difference between the position of a celestial object measured from the Earth's surface and the position that would be recorded by a hypothetical observer at the center of the Earth. Same as → geocentric parallax.→ diurnal; → parallax. dive   ۱) غوته ۲) غوته خوردن   1) quté, 2) quté xordanFr.: 1) plongon; 2) plonger   1a) An act or instance of diving. 1b) A jump or plunge into water, especially in a prescribed way from a diving board. 2a) To go below the surface of the water, as a submarine. 2b) To → plunge into water, especially headfirst. 2c) Aeronautics: (of an airplane) to descend rapidly (Dictionary.com).M.E. diven "to dive, dip," O.E. dufan (strong verb) "to dive, duck, sink" and dyfan "to dip, submerge" (weak, transitive), related to → deep.Quté is possibly Pers., since Farhang-e Asadai records it with "t" and not Ar. "tayn" (Dehxoda), although its etymology is not established. We propose ultimately from Proto-Ir. *ui-pat-, from *pat- "to fall, to fly," to which is related Pers. oft-, oftâdan "to → fall;" cf. Pashto. qupah "a dip, a dive, a plunge." diverge   واگراییدن   vâgerâyidan (#)Fr.: diverger   (v.intr.) To move, or extend in different directions from a common point. Math.: Of a sequence or series, to have no unique limit. M.L. divergere, from → di- "apart," variant of → dis- + vergere "to bend, turn, incline," from PIE *werg- "to turn," from base *wer- "to turn, bend" (cf. L. vertere "to turn," Av. varət- "to turn," Mod.Pers. gard, gardidan "to turn," Skt. vartate "turns round, rolls," Gk. rhatane "stirrer, ladle," Ger. werden, O.E. weorðan "to become."Verâyidan, from vâ- "apart," → de-, + gerâyidan "to incline toward; to intend; to make for," infinitive of gerâ, the etymology of which is not clear. Gerâ may be a variant of Mod.Pers. kil "bent, inclined" (k/g and l/r interchanges), from PIE base *klei- "to lean, incline," cognate with L. clinare "to bend" (E. declination, inclination, etc.), Gk. klinein "to cause to slope, slant, incline," Skt. sri- "to lean," O.Pers. θray-, Av. sray- "to lean," P.Gmc. *khlinen (Ger. lehnen, E. lean). divergence   واگرایی   vâgerâyi (#)Fr.: divergence   1) The act, fact, or amount of diverging. 2) Math.: A differential → operator that, for a three-dimensional vector function F(x,y,z), is the sum of the → scalar products of the unit vectors and the partial derivatives in each of the three component directions. It is written as div F or ∇ . F = (∂F/∂x)i + (∂F/∂y)j + (∂F/∂z)k, ∇ being the → del operator or → nabla. The divergence of a vector field is a → scalar field. In physics, this operator is used to derive the amount of flux per unit volume leaving an infinitesimal element of volume at a point in a vector field. For example, in an electrostatic field, the divergence of the field is zero unless the volume element contains an electric charge.From diverge, → diverge, + -ence a noun suffix.Vâgerâyi, from vâgerâ stem of vâgerâyidan, → diverge, + noun suffix -i. divergence theorem   فربین ِ واگرایی   farbin-e vâgerâyiFr.: théorème de flux-divergence   Same as → Gauss's theorem.→ divergence; → theorem. divergent   واگرا   vâgerâ (#)Fr.: divergent   Relating to or causing divergence. Gowing away in different directions from a common point or path. Math.: Failing to approach a limit.M.L. divergent-, stem of divergens pr.p. of divergere, from → di- "apart," variant of → dis- + vergere "to bend, turn, incline," from PIE *werg- "to turn," from base *wer- "to turn, bend" (cf. L. vertere "to turn," Av. var ət- "to turn," Mod.Pers. gard, gardidan "to turn," Skt. vartate "turns round, rolls," Gk. rhatane "stirrer, ladle," Ger. werden, O.E. weorðan "to become."Vâgerâ, agent noun from vâgerâyidan, → diverge + noun suffix -i. divergent lens   عدسی ِ واگرا   adasi-ye vâgerâ (#)Fr.: lentille divergente   A lens which causes a parallel beam of light passing through it to diverge or spread out; concave lens. Same as diverging lens and → negative lens.→ divergent; → lens. diverse   گوناگون   gunâgun (#)Fr.: diversité   1) Differing from one another. 2) Composed of various kinds or forms; multiform.M.E., from L. diversus, p.p. of divertere "to divert," from → di- + vert, from vertere "to turn," → convert.Gunâgun, literally "of different kinds, sorts, species," from gun "kind, species, sort." diversity   گوناگونی   gunâguni (#)Fr.: diversité   The state or fact of being diverse; difference; unlikeness.→ diverse; → -ity. dividend   بخشی   baxši (#)Fr.: dividende   A number which is to be divided by another number (→ divisor). Example: 36 in the expression 36 : 9 = 4.From L. dividendum "thing to be divided," → division.Bâxši, from bâxš, → division.