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
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 mekâniki

Fr.: 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 mekâniki

Fr.: 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.

  ساز-و-کاریکانه، ساز-و-کاروارانه   
sâzokârikâné, sâzokârvârâné

Fr.: mécaniquement   

1) In a mechanical manner; by a mechanism.
2) In a machine-like manner; without feeling.

mechanical; → -ly.

  ساز--و-کارمند، ساز-و-کار-گر   
sâzokârmand, sâzokârgar

Fr.: mécanicien   

A person skilled in constructing, working, or repairing machines; mechanic; machinist (

From → mechanic + -ian.

  مکانیک، ساز-و-کاریک   
mekânik (#), sâzokârik

Fr.: mécanique   

A branch of → physics that deals with motion and the → action of → forces on bodies. Mechanics may be divided into three areas, → kinematics, → dynamics, and → statics.

From mechanic, from L. mechanicus, from Gk. mekhanikos "an engineer," also "inventive," literally "pertaining to machines" (adj.), from mekhane, → machine, + → -ics.

Mekânik, loan from Fr. Sâzokârik, from sokâr, → mechanism, + -ik, → -ic.

sâzokâr (#)

Fr.: mécanisme   

1) The structure or arrangement of parts of a machine or similar device, or of anything analogous.
2) The agency or means by which an effect is produced or a purpose is accomplished.

From Mod.L. mechanismus, from Gk. mekhane, → machine.

Sâzokâr, literally "making and working," from sâz "apparatus; (musical) instrument," from sâzidan, sâxtan "to build, make, fashion; to adapt, adjust, be fit" (from Mid.Pers. sâxtan, sâz-, Manichean Parthian s'c'dn "to prepare, to form;" Av. sak- "to understand, to mark," sâcaya- (causative) "to teach") + kâr "work," from kardan "to do, to make" (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "he makes;" cf. Skt. kr- "to do, to make," krnoti "he makes, he does," karoti "he makes, he does," karma "act, deed;" PIE base kwer- "to do, to make").

miyâné (#)

Fr.: médiane   

Statistics: The middle value in a sample sorted into ascending order. If the sample contains an even number of values, the median is defined as the mean of the middle two.
Geometry: The line from a vertex of a triangle to the midpoint of the opposite side.

From M.Fr. médian, from L. medianus "of the middle," from medius "middle;" akin to Pers. middle, → medium, → meddle; from PIE *medhyo-, from base *me- "between;" → medium.

Miyâné from miyân, → middle, + nuance suffix.

pezeški (#)

Fr.: médecine   

The art or science of restoring or preserving health or due physical condition, as by means of drugs, surgical operations or appliances, or manipulations (

M.E. medicin, from O.Fr. medecine "art of healing, cure," from L. medicina "the healing art; a remedy," feminine of medicinus (adj.) "of a doctor," from medicus "a physician;" PIE root *med- "to measure, limit, consider, advise," → dimension; cf. Av. vi-mad- "physician;" Gk. medein "to rule;" L. meditari "think or reflect on, consider," → meditation; Ir. miduir "judge;" O.E. metan "to measure out."

Pezeški, from pezešk "physician," from Mid.Pers. bizešk "physician," bêšâz "medicinal;" Av. bišaz- "to cure, heal;" cf. Skt. bhisaj- "healer, physician."

segâlidan (#)

Fr.: méditer   

To engage in thought or contemplation; reflect. → consider.

Back formation from → meditation.

Segâlidan "to meditate, consider, think," from Mid.Pers. uskaridan "to think, consider, discuss," from us-, → ex-, + kar- "to observe, to consider;" related to engâridan, negaristan, âgâridan, → consider.

segâleš (#)

Fr.: méditation   

The act of meditating. → consideration.

From L. meditatatus p.p. of meditari "to think over, reflect, consider," from PIE root *med- "to measure, limit, consider, advise," → mode.

Verbal noun of → meditate.


Fr.: milieu   

An intervening substance through which an effect is produced; surrounding objects, conditions, or influences; environment. → interstellar medium.

From L. medium, from neut. of adj. medius "middle," from PIE *medhyo- "middle;" cf. Av. maδəma- "middle," as below.

Madim, from Av. maδəma- [adj.] "middle, being in the middle; middling, of a middling size or quality," maiδim "in the midst of," maiδyāna- "the middle;" cf. Skt. mádhya- "middle;" Gk. messos; Goth. midjis; O.E. midd "middle;" O.C.S. medzu "between," Arm. mej "middle;" L. medium, as above.


Fr.: renconter   

To come upon; come into the presence of; encounter.

M.E. meten, from O.E. metan "to find, find out; encounter; obtain," cognate with O.Frisian meta, O.Sax. motian "to meet," Goth. gamotijan, ultimately from PIE root *mod- "to meet, assemble."

Mavâzidan, from Sogd. mwz "to meet together, encounter" (Cheung 2007); ultimately from Proto-Ir. *ham-uaz-, from *ham- "together, → com-," + *uaz- "to move, carry, drive;" cf. Av. vaz- "to move, carry, drive (a chariot);" Pers. vazidan "to blow;" parvâz "→ flight."


Fr.: rencontre   

1) The act of coming together.
2) An → assembly or conference of persons for a specific purpose (

meet; → -ing.

megâ- (#)

Fr.: méga-   

1) Prefix, often meaning "large, great."
2) Prefix meaning 106.

From Gk. megas "great, large, mighty," from PIE *meg- "great;" cf. L. magnus, Goth. mikils, O.E. micel.

megaparsec (Mpc)
megâpârsek (#)

Fr.: mégaparsec   

A unit of distance equal to a million → parsec (pc)s, or 3.26 million → light-years.

mega-; → parsec.


Fr.: mégastructure   

Same as → Dyson sphere.

mega-; → structure.

megatons of TNT
  مگاتن ِ TNT   
megâton-e TNT (#)

Fr.: megatonnes de TNT   

A unit of explosive force equal to one million metric tons of → T.N.T.. 1 megaton = 4.2 × 1022 → ergs = 4.2 × 1015 → joules.

mega-; → ton.

Megrez (δ Ursae Majoris)
maqrez (#)

Fr.: Megrez   

One of the seven stars of the → Big Dipper, which links Ursa Major's tail to the Bear's hindquarters. Megrez is the dimmest of the Big Dipper stars at magnitude +3.3. It is an A3 dwarf, about 20 times more luminous that the Sun, lying 81 light-years away.

From Ar. al-Maghriz(المغرز) "the root, base, bottom" (of the Bear's tail).


Fr.: Meissa, Lambda (λ) Orionis   

A → giant star of → apparent visible magnitude 3.54 in the → Orion constellation. λ Ori is of → spectral type O8 III, has a mass of about 28 → solar masses, a size of about 10 → solar radii, and an → effective temperature of around 35,000 K. Meissa is a → soft X-ray source with a → luminosity of 1032 erg s-1 and peak emission in the energy range of 0.2-0.3 keV, which is probably generated by the → stellar wind. Meissa is a member of the → Orion OB1 association. It is in fact a → double star with a → companion at an angular separation of 4.41 arcseconds. This fainter component has a magnitude of 5.61, is a → main sequence star of → spectral type B0.5 V. There is an outlying component, Meissa C, which is an F-type main sequence F8 V star. This star in turn may have a very low mass companion that is probably a brown dwarf. λ Ori, excites a fairly symmetric → H II region, Sh2-264 surrounding it. Many observational studies have found dark clouds external to this H II region.

Arabic al-maysan (مَیسان) "bright."

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