An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 731
mean position
  نهش ِ میانگین   
neheš-e miyângin

Fr.: position moyenne   

Same as → mean place.

mean; → position.

mean profile
  فراپال ِ میانگین   
farâpâl-e miyângin

Fr.: profil moyen   

The shape of a pulsar's pulse as determined by averaging several pulses.

mean; → profile.

mean sidereal day
  روز ِ اختری ِ میانگین   
ruz-e axtari-ye miyângin

Fr.: jour sidéral moyen   

The average time interval between two successive → upper transits of the → mean equinox.

mean; → sidereal; → day.

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 miyângin

Fr.: 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 miyâni

Fr.: 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 miyângin

Fr.: 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.

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.

  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; the quantity obtained by such a process.
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").

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 andâzegiri

Fr.: 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.

  ساز-و-کارمند، ساز-و-کارگر   
sâzokârmand, sâzokârgar

Fr.: mécanicien   

A person who repairs and maintains machinery, motors, etc. ( Same as → mechanician.


  ساز-و-کاریک، ساز-و-کاروار   
sâzokârik, sâzokârvâr

Fr.: mécanique   

1) Of, connected with, produced by → mechanics.
2) Like machines; automatic.

mechanic; → -al.

mechanical energy
  کاروژ ِ مکانیکی   
kâruž-e mekâniki

Fr.: 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 mekâniki

Fr.: 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; → equilibrium.

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 mekâniki

Fr.: mélange mécanique   

Any → mixing process that utilizes the → kinetic energy of relative → fluid motion.

mechanical; → mixing.

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