An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Denebola (β Leonis)
  شیردم، ذنب الاسد   
Širdom, Zanab-ol-asad (#)

Fr.: Denebola   

The second brightest star, of magnitude V = 2.14, in the constellation → Leo. A → main sequence star of → spectral type A3 V.

Denebola, from Ar. dhanab al-asad (ذنب الاسد) "tail of the lion," referring to the lion in Gk. mythology.

Širdom "tail of the lion," from šir "lion" → Leo + dom "tail," → comet. Zanab-ol-asad from Ar., as above.

denomination
  آنامنش   
ânâmeneš

Fr.: groupe, catégorie, unité; dénomination   

1) A name or designation.
2) The action of naming or classifying something. 3) One of the grades or degrees in a series of designations of quantity, value, measure, weight, etc. (Dictionary.com).

Verbal noun of → denominate.

dense core mass function
  کریای ِ جرم ِ مغزه‌ی ِ چگال   
karyâ-ye jerm-e maqze-ye cagâl

Fr.: fonction de masse des cœurs denses   

core mass function.

dense; → core; → mass; → function.

density fluctuation
  افتاخیز ِ چگالی   
oftâxizhâ-ye cagâli

Fr.: fluctuations de densité   

In the early Universe, localized enhancements in the density of either matter alone or matter and radiation. According to models, very small initial fluctuations (less than 1 percent) can lead to subsequent formation of galaxies.

density; → fluctuation.

density-bounded H II region
  ناحیه‌ی ِ H IIی ِ چگالی‌کرانمند   
nâhiye-ye H II-ye cagâli karânmand

Fr.: bornée par la densité   

An → H II region which lacks enough matter to absorb all → Lyman continuum photons of the → exciting star(s). In such an H II region a part of the ionizing photons escape into the → interstellar medium. See also → ionization-bounded H II region.

density; → bounded; → region.

depletion
  تیسایش   
tisâyeš

Fr.: déplétion   

General: The act or process of depleting. The state of being depleted.
Astro.: The process or state of a material which contains less of a particular chemical element or isotope than the expected standard amount.

Noun from → deplete

depletion layer
  لایه‌ی ِ تیسایش   
lâye-ye tisâyeš

Fr.: couche de déplétion   

The region of a semiconductor in which the density of mobile carriers is too low to neutralize the fixed charge density of donors and acceptors.

depletion; → layer.

depletion time
  زمان ِ تیسایش   
zamân-e tisâyeš

Fr.: temps de déplétion   

The time it takes for a given → chemical species to be reduced below a significant level of → abundance in a → compound or → object.

depletion; → time.

depolarization
  واقطبش   
vâqotbeš (#)

Fr.: dépolarisation   

Reducing or randomizing the polarization of an electromagnetic wave, by transmission through a non-homogeneous medium or a depolarizer.

from → de- + → polarization.

deportation
  وابرتش   
vâbarteš

Fr.: déportation   

The action of deporting an alien from a country.

deport; → -tion.

deposition
  وانهش   
vâneheš

Fr.: dépôt   

The process by which water vapor changes directly to ice without first becoming a liquid. This is how snow forms in clouds, as well as frost and hoar frost on the ground. The opposite of deposition is → sublimation. → condensation.

M.E., from O.Fr. deposition, from L. deposition- "putting aside, testimony, burial," from deposit(us) "laid down," p.p. of deponere "to put down," from → de- + ponere "to put, place."

Vâneheš, from vâ-de- + neheš verbal noun of nehâdan "to put, place," Mid.Pers. nihâtan, O.Pers./Av. ni- "down; into," → ni-, + dā- "to put; to establish; to give," dadāiti "he gives," cf. Skt. dadâti "he gives," Gk. didomi "I give," L. do "I give;" PIE base *do- "to give."

depredation
  واچَوِش   
vâcaveš

Fr.: déprédation   

An act of attacking or plundering.

de-; → predation.

depression
  ۱) نشیب ِ افق؛ ۲) فروبار؛ ۳) نشیب‌لاخ   
1) našib-e ofoq; 2) forubâr; 3)

Fr.: dépression   

1) Navigation:dip.
2) Meteorology: An area of low atmospheric pressure.
3) Geology: An area of the Earth's crust sunken or depressed below the surrounding area, formed by various mechanisms.

Depression, verbal noun of depress, from O.Fr. depresser, from L.L. depressare, frequentative of pressus, p.p. of deprimere "press down," from → de- "down" + premere "to press."

1) Našib-e ofoq, from našib "declivity, descent; lowness of ground, slope of any place" (Mid.Pers. nišēp "declivity, (astrology) dejection," Av. *nixšvaēpā-, xšvaēpā- "bottom, rear") + ofoqhorizon. 2) Forubâr, from foru "down, downward; below; beneath," → de- + bâr "load, pressure, charge," → charge. 3) Našiblâx, from našib, as above, in item 1, + -lâx place suffix.

derivation
  واخنش   
vâxaneš

Fr.: dérivation   

1) General: The act or fact of deriving or being derived; origin; descent.
2) Math.:differentiation; development of a theorem.
3) Grammar: The formation of a word from another word or base. It typically occurs by the addition of an affix.

Verbal noun of → derive.

description
  واوشت   
vâvešt

Fr.: description   

1) The act or method of describing.
2) A statement, picture in words, or account that describes.
3) Geometry: The act or process of describing a figure.

Verbal noun of → describe.

designation
  نامگزینی   
nâmgozini (#)

Fr.: designation   

A distinctive name or title; appellation. → Bayer designation; → Flamsteed designation; → variable star designation.

From L. designatus, p.p. of designare "to mark out, choose, appoint," from → de- "out" + signare "to mark," from signum, → sign.

Nâmgozini, from nâm, → name, + gozini "choosing," from gozidan "to chose," → select.

desorption
  واشم   
vâšam

Fr.: désorption   

A physical or chemical process by which a substance that has been sorbed (adsorbed or absorbed) by a liquid or solid material is removed from the material. Reverse of → sorption. → absorption; → adsorption.

Verbal noun of → desorb.

detection
  آشکارش   
âškâreš (#)

Fr.: détection   

The act or state of detecting, → detect
Any operation on an electrical or electromagnetic signal to recover information from it.

M.E., from L.L. detection-, from detect(us), → detect, + -ion.

škâreš, from âškâr present-tense stem of âškâridandetect + verbal noun suffix.

determination
  آترم، آترمش   
âtarm, âtarmeš

Fr.: détermination   

The act of deciding definitely and firmly; the result of such an act of decision.

Verbal noun of → determine.

detonate
  تراکیدن   
tarâkidan (#)

Fr.: détoner, faire détoner, faire exploser   

1) To set off a → detonation. 2) To explode or cause to explode.

From L. detonatus, p.p. of detonare "to thunder down, roar out," from → de- + tonare "to thunder," cf. Pers. tondar "thunder," Skt. stanáyati "thunders," tanyatá- "thundering," Gk. stonos "groan," stenein "to groan," Thôrr "the Old Norse god of thunder," P.Gmc. *thunraz (Du. donder, Ger. Donner "thunder," E. thunder, Fr. tonnerre), PIE base *(s)tene- "to resound, thunder."

Tarâkidan "to split, cleave; to make a noise in splitting," variants tarakidan, taraqidan, taraqqé "firecracker," from tarâk/tarak "split, cleft, crack; the noise of anything when splitting or cleaving," maybe related to Pers. dar-, daridan "to tear, cut," Av. dar- "to tear," dərəta- "cut," auua.dərənant- "shattering," Skt. dar- "to crack, split, break, burst," darati "he splits," cf. Gk. derma "skin," E. tear, Ger. zerren "to pull, to tear," zehren "to undermine, to wear out," PIE base *der- " to split, peel, flay."

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