# 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: 712
 mean sidereal time   زمان ِ اختری ِ میانگین   zamân-e axtari-ye miyângin (#)Fr.: temps sidéral moyen   The hour angle of the mean equinox for a given observer.→ mean; → sidereal; → time. mean solar day   روز ِ خورشیدی ِ میانگین   ruz-e xoršidi-ye miyângin (#)Fr.: jour solaire moyen   The average length of the apparent solar day. In other words, the interval between successive transits of the mean Sun for a given observer.→ mean; → solar; → day. mean solar time   زمان ِ خورشیدی ِ میانگین   zamân-e xoršidi-ye miyângin (#)Fr.: temps solaire moyen   The time since the mean Sun crossed the meridian with 12 hours added to make the day begin at midnight.→ mean; → solar; → time. mean spectrum   بیناب ِ میانگین   binâb-e miyânginFr.: spectre moyen   A plot of the mass-to-charge ratio of elementary particles, sorted by their isotopic mass.→ mean; → spectrum. mean Sun   خورشید ِ میانگین   xoršid-e miyângin (#)Fr.: Soleil moyen   A hypothetical Sun that moves along the ecliptic at a uniform rate equal to the average motion of the real Sun.→ mean; → sun. mean term   ترم ِ میانی   tarm-e miyâniFr.: terme moyen   In → syllogism, the term which is common to both → premises and is excluded from the → conclusion.→ mean; → term. mean value theorem   فربین ِ ارزش ِ میانگین   farbin-e arzeš-e miyânginFr.: théorème des accroissements finis   1) If f(x) is a continuous function on the interval from a to b, then: ∫ f(x) dx = f(c)(b - a) (summed from a to b) for at least one point in that interval. 2) More generally, If f(x) and g(x) are continuous functions on the interval from a to b and g(x)≥ 0, then: ∫ f(x)g(x) dx = f(c) ∫ g(x) dx (both integrals summed from a to b).→ mean; → value; → theorem. meaning   چمار   cemâr (#)Fr.: sens, signification   The sense or significance of a word, sentence, symbol, etc. The study dealing with meanings is called → semantics. See also → semiotics.M.E., from mean; O.E. mænan "to mean, intend, signify" (cf. O.Fris. mena "to signify," O.S. menian "to intend, signify," M.Du. menen, Du. meenen, Ger. meinen "think, suppose"), related to Pers. maneš "disposition, temperament," mênidan "to think, consider," → idea; + → -ing.Cemâr, from cem or cim "meaning, signification;" Mid.Pers. cim "meaning, reason, cause;" ultimately from Proto-Ir. *cahmāt "wherefore?" cf. Skt. kasmāt "why, where from? whence?," kim "what? how? why?" + âr short form of âvar present stem of âvardan "to cause or produce; to bring," → production, as in bonâr, → cause, used also as a nuance suffix; see also the verb → mean. measure   ۱) اندازه؛ ۲) اندازه گرفتن   1) (n.) andâzé (#); 2) (v.) andâzé gereftan (#)Fr.: 1) mesure; 2) mesurer   1) A unit or standard of → measurement; the act or process of ascertaining the extent, dimensions, or quantity of something; measurement. 2) To use standard units to determine the magnitude, extent, size, etc. of something. The quantity obtained by such a process.From O.Fr. mesurer, from L.L. mensurare "to measure," from L. mensura "a measuring, a thing to measure by," from mensus, p.p. of metiri "to measure," → meter.1) Andâzé "measure," from Mid.Pers. andâzag, handâcak "measure," handâxtan, handâz- "to measure," Manichean Mid.Pers. hnds- "to measure," Proto-Iranian *hamdas-, from ham-, → com-, + *das- "to heap, amass;" cf. Ossetic dasun/dast "to heap up;" Arm. loanword dasel "to arrange (a crowd, people)," das "order, arrangement." 2) Andâzé gereftan, compound verb, literally "to take measure," from andâzé, as above, + gereftan "to take, seize" (Mid.Pers. griftan; Av./O.Pers. grab- "to take, seize;" cf. Skt. grah-, grabh- "to seize, take," graha "seizing, holding, perceiving;" M.L.G. grabben "to grab;" from P.Gmc. *grab; E. grab "to take or grasp suddenly;" PIE base *ghrebh- "to seize"). measurement   اندازه‌گیری   andâzegiri (#)Fr.: mesure   1) The act of measuring; a measured quantity. 2) The determination of the magnitude or amount of a quantity by comparison (direct or indirect) with the prototype standards of the system of units employed (IEEE Standard Dictionary of Electrical and Electronics Terms). → absolute measurement, → measurement uncertainty, → Roemer's measurement.Verbal noun of → measure. measurement uncertainty   ناتاشتیگی ِ اندازه‌گیری   nâtâštigi-ye andâzegiriFr.: incertitude de mesure   The interval within which lies the actually measured value of a physical quantity and the true value of the same physical quantity.→ measurement; uncertainty, from negation prefix un- + → certainty. mechanic   ساز-و-کارمند، ساز-و-کارگر   sâzokârmand, sâzokârgarFr.: mécanicien   A person who repairs and maintains machinery, motors, etc. (Dictionary.com). Same as → mechanician. mechanical   ساز-و-کاریک، ساز-و-کاروار   sâzokârik, sâzokârvârFr.: mécanique   1) Of, connected with, produced by → mechanics. 2) Like machines; automatic.→ mechanic; → -al. mechanical energy   کاروژ ِ مکانیکی   kâruž-e mekânikiFr.: énergie mécanique   The energy that is possessed by an object due to its motion or due to its position. It is equal to the sum of the → kinetic energy and → potential energy.→ mechanical; → energy. mechanical equilibrium   ترازمندی ِ مکانیکی   tarâzmandi-ye mekânikiFr.: équilibre mécanique   1) The state of a → rigid body if, as viewed from an → inertial frame of rest: 1) the → linear acceleration of its → center of mass is zero, and 2) its → angular acceleration about any axis fixed in this reference frame is zero. The center of mass may be moving with constant velocity and the body may be rotating about a fixed axis with constant angular velocity. 2) In → thermodynamics, the state of a system in which → pressure is the same every where with no other forces acting on the system except a uniform external pressure. mechanical equivalent of heat   هم‌ارز ِ مکانیکی ِ گرما   ham-arz-e mekâniki-ye garmâ (#)Fr.: équivalent mécanique de chaleur   Same as → Joule's constant.→ mechanical; → equivalent; → heat. mechanical mixing   آمیزش ِ مکانیکی   âmizeš-e mekânikiFr.: mélange mécanique   Any → mixing process that utilizes the → kinetic energy of relative → fluid motion.→ mechanical; → mixing. mechanical power   توان ِ مکانیکی   tavân-e mekâniki (#)Fr.: puissance mécanique   The → rate at which → work is done by a → force. In other words, → mechanical energy per unit time. Mechanical power is expressed in units of joules/sec (joules/s) or a watt (W) in the → mks system.→ mechanical; → power. mechanical system   راژمان ِ مکانیکی   râžmân-e mekânikiFr.: système mécanique   1) Any system of elements that interact according to the laws of → mechanics (as distinguished from chemical, electrical, thermal, etc.). 2) A collection of → machines functioning together to achieve the transfer of motion.→ mechanical; → system. mechanical wind   باد ِ مکانیکی   bâd-e mekânikiFr.: vent mécanique   A process in which matter is shed into a → Keplerian disk from a star rotating at the → critical velocity. The disk is probably destroyed by the pressure exerted by the stellar radiation and finally matter is lost. Such a process seems to occur around → Be stars which are stars rotating at or very near the critical limit (Meynet et al. 2007, arXiv:0709.2275).→ mechanical; → wind.