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

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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 dependent   وابسته   vâbasté (#)Fr.: dépendant   1) General: Determined or conditioned by something else. 2) Math.: A variable whose value depends on the value assigned to another variable. 3) Statistics: An event which is not independent.M.E. dependant, from M.Fr., pr.p. of dépendre, from L. dependere, from → de- + pendere "to hang, be suspended," PIE base *(s)pen(d)- "to pull, stretch."Vâbasté, from vâ-→ de- + basté p.p. of bastan "to bind, shut," from Mid.Pers. bastan/vastan "to bind, shut," Av./O.Pers. band- "to bind, fetter," banda- "band, tie," cf. Skt. bandh- "to bind, tie, fasten," PIE *bhendh- "to bind" (Ger. binden, E. bind). dependent variable   ورتنده‌ی ِ وابسته   vartande-ye vâbastéFr.: variable dépendante   Math.: A variable whose value depends on the value assigned to another value. For example, in the equation y = 2x, the value of y depends on that of x. See also → independent variable.→ dependent; → variable. dephase   وافازیدن   vâfâzidanFr.: déphaser   To make two signals out of phase. For example, to get one signal at its highest peak while the other signal is at its lowest peak; they will be 180 degrees out of phase.→ de-; → phase. dephased   وافازیده   vâfâzidéFr.: déphasé   Same as → out of phase.Past participle of → dephase. deplete   تیساییدن   tisâyidanFr.: amenuiser, réduire   To decrease markedly the supply or abundance of; exhaust; to cause → depletion.From L.L. depletionem "blood-letting," from L. deplere "to un-fill, to empty out," from → de- "off, away" + plere "to fill," from plenus "full," from PIE *ple- "to be full," PIE base *pelu- "full," cf. O.Pers. paru- "much, many," Av. parav-, pauru-, pouru-, par- "to fill," Mod.Pers. por "full," Skt. puru-, Gk. polus. por "full," Gk. polus, O.E. full "full," from P.Gmc. *fullaz, O.H.G. fol, Ger. voll, Goth. full.Tisâyidan, from Tabari tisâ "empty, naked, bare" + -idan infinitive suffix. Variants of tisâ in dialects and literary Pers.: Saraxsi, Lâsgardi, Sangesari tusâ "empty, naked," Aftari tussâ "empty," literary Pers. tohi "empty," Mid.Pers. tuhig, Av. taoš- "to become empty," pres. tusa-, caus. taošaya-, tusən "they lose their posture," Skt. tuccha-, tucchya- "empty," L. tesqua, tesca "deserted place," Russian tošcij "hollow;" PIE base *teus- "to empty." depletion   تیسایش   tisâyešFr.: 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 tisâyešFr.: 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 tisâyešFr.: 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. depopulate   واپرینیدن   vâporinidanFr.: dépuepler   To remove or reduce the population of, as by destruction or expulsion (Dictionary.com).→ de-; → populate. deport   وابرتیدن   vâbartidanFr.: déporter   To expel forcibly a foreigner from a country; banish.→ de-; → export. deportation   وابرتش   vâbartešFr.: déportation   The action of deporting an alien from a country.→ deport; → -tion. deposit   ۱) لرد؛ ۲) لرد انداختن، ~ افتادن، لردیدن   1) lerd; 2) lerd andâxtan, lerd oftâdan, lerdidanFr.: 1) dépôt, gisement, lie, tarte; 2) déposer, se déposer   1a) Something precipitated, delivered and left, thrown down, or accumulated, as by a natural process. 1b) Substance which settles down from a solution or a suspension, such as the natural sediment of wine in a bottle. See also → sediment. 2) To leave or form a layer of some substance (sand, sediment, etc.) as a gradual process in one place, or be left in this way.From L. depositus, p.p. of deponere "to lay aside, put down," from → de- "away" + ponere "to put," → position.Lerd "sediment, tartar of wine," probably a variant of dord "dregs, lees, sediment, tartar of wine." deposition   وانهش   vânehešFr.: 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   vâcavešFr.: 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") + ofoq→ horizon. 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. deprive   آزوَ‌ندن   âzvandanFr.: priver   To remove or withhold something from the enjoyment or possession of (Dictionary.com).M.E. depriven, from O.Fr. depriver, from L. deprivare, from → de- + privare "to separate, rob," → privateÂzvandan, from âz- "out, away," → ex-, + van, contraction of vand, band "to bind, fasten, close," → private. depth   ژرفا   žarfâ (#)Fr.: profondeur   Noun form of → deep. → optical depth.From M.E. depthe, from O.E. deop "deep," → deep + -the "-th."Žarfâ, noun of žarf "deep," → deep + -â. derivation   واخنش   vâxanešFr.: 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. derivative   واخنه   vâxanéFr.: 1) dérivé; 2; 3) dérivée   1) General: Derived from another; not original or primitive. 2) Math.: For a → function  y = f(x), the → limit of the → ratio of the → increment of the function, Δy, to the increment of the → variable, Δx, as the latter tends to → zero. Derived function; result of → differentiation. 3) Chemistry: Substance derived or prepared from some other → substance.From M.E. derivatif, from L.L. derivativus, from derivat(us), p.p. of derivare, → derive + -ivus.Vâxané, noun from vâxan, present stem of vâxanidan, → derive.