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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 655
elementary time
  زمان ِ بنیادین   
zamân-e bonyâdin

Fr.: temps élémentaire   

The time required for → light to cross the classical radius of the electron (→ electron radius): te = re/c ≅ 10-23 s.

elementary particle; → time.

elements of the orbit
  بن‌پارهای ِ مدار، عنصرهای ~   
bonpârhâ-ye madâr, onsorhâ-ye ~ (#)

Fr.: éléments orbitaux   

orbital element.

element; → orbit.

elephant trunk
  خرطوم ِ فیل   
xortum-e fil

Fr.: trompe d'éléphant   

An elongated structure of → interstellar dust and gas which absorbs the radiation from background stars in an → H II region. These structures are the denser remnants of → molecular clouds from which → massive stars are formed. Elephant trunks are eventually dissipated by the action of the → ionizing radiation and → stellar wind of the associated massive stars. A remarkable example of these structures is displayed by the → HST image of the → Eagle Nebula as → pillars of obscuring matter protruding from the interior wall of a dark molecular cloud. Some → Bok globules may represent the remaining densest fragments of elephant trunks.

M.E. elephant, from O.Fr. olifant, from L. elephantus, from Gk. elephas "elephant, ivory," probably from a non-I.E. language, likely via Phoenician; trunk, from M.E. trunke, O.Fr. tronc, from L. truncus "stem, trunk, stump."

Xortum "the proboscis of an elephant," loanword from Ar. xartum; fil, pil "elephant," from Mid.Pers. pil "elephant;" O.Pers. piru- "ivory."

Elephant's Trunk Nebula
  میغ ِ خرطوم ِ فیل   
miq-e xortum-e fil

Fr.: Nébuleuse de la trompe d'éléphant   

An elongated dark structure of gas and dust in the → H II region IC 1396. It spans about 5 degrees on the sky in the constellation → Cepheus, about 2400 → light-years from the Earth. The Elephant Trunk Nebula is believed to be site of star formation, containing several very young stars. It is an example of → elephant trunks associated with star forming regions.

elephant trunk; → nebula.

elevate
  بالاییدن   
bâlâyidan

Fr.: élever   

1) To move or raise to a higher place or position; lift up.
2) To raise to a higher state, rank, or office; exalt; promote (Dictionary.com).

From L. elevatus, p.p. of elevare "to lift up, raise," from → ex- "out" + levare "lighten, raise," from levis "light" in weight, → lever.

Bâlâyidan, from bâla "up, above, high, elevated, height," related to boland "high," borz, "height, → magnitude."

elevating floor
  کف ِ بالارو   
kaf-e bâlârow (#)

Fr.: plancher mobile   

The floor below a telescope used to lift observers to the level of the telescope's eyepiece, since the telescope is tilted at varying angles when it is in use.

Elevating, adj. of → elevate; → floor.

elevation
  بالایش   
bâlâyeš

Fr.: élevation   

1) The height to which something is elevated or to which it rises.
2) An elevated place, thing, or part; an eminence (Dictionary.com).

Verbal noun of → elevate; → -tion.

eliminate
  اساندن   
osândan

Fr.: éliminer   

1) To remove or get rid of, especially as being in some way undesirable.
2) Math.: To remove (an unknown variable) from two or more simultaneous equations (Dictionary.com).

L. eliminatus, p.p. of eliminare "to thrust out of doors, expel," from ex limine "off the threshold," from → ex- "off, out" + limine, ablative of limen "threshold."

Osândan, from Tabari uzitan, huzənniyən, hozənniyan "to expel," from os- "out," → ex-, + -ândan suffix of transitive verbs.

elimination
  اسانش   
osâneš

Fr.: élimination   

1) The act of eliminating; the state of being eliminated.
Math.: The process of solving a system of simultaneous → equations by using various techniques to remove the → variables successively (Dictionary.com).

Verbal noun of → eliminate; → -tion.

ellipse
  بیضی   
beyzi (#)

Fr.: ellipse   

The locus of a point the sum of whose distances from two fixed points is constant.

From O.Fr. ellipse, from L. ellipsis "ellipse," also, "a falling short, deficit," from Gk. elleipsis "an omission," from el-, variant of en-, + leip-, stem of leipein "to leave" + suffix -sis.

Beyzi, from Ar.

ellipsoid
  بیضی‌وار   
beyzivâr (#)

Fr.: ellipsoïde   

A three-dimensional geometric figure resembling a flattened sphere. It is generated by rotating an ellipse around one of its axes.

From → ellipse + → -oid.

elliptic
  بیضی‌گون   
beyzigun (#)

Fr.: elliptique   

Relating to or having the form of an → ellipse. Same as → elliptical.

From Gk. elleiptikos "pertaining to an ellipse," from elleipein "to fall short, leave out," from en- "in" + leipein "to leave," + → -ic.

Beyzigun, from beyzi, → ellipse, + -gun, from gun "resembling; manner, fashion; color" (Mid.Pers. gônak "kind, species;" Av. gaona- "color").

elliptic aberration
  بیراهش ِ بیضی‌گون   
birâheš-e biyzigun

Fr.: aberration elliptique   

That part of → annual aberration proportional to the → eccentricity of the Earth's orbit.

elliptic; → aberration.

elliptical
  بیضی‌گون   
beyzigun (#)

Fr.: elliptique   

Pertaining to or having the shape of a geometric ellipse.

elliptic; → -al.

elliptical galaxy
  کهکشان ِ بیضی‌گون   
kahkašân-e beyzigun (#)

Fr.: galaxie elliptique   

A galaxy whose structure is smooth without spiral arms and ellipsoidal in shape. Ellipticals are redder than spirals of similar mass. Giant ellipticals contain over 1012 solar masses, whereas dwarf ellipticals have masses as low as 107 solar masses.

elliptical; → galaxy.

elliptical polarization
  قطبش ِ بیضی‌گون   
qotbeš-e beyzigub

Fr.: polarization elliptique   

The → polarization of an → electromagnetic radiation in which the electric vector at any point in the path of the beam describes an ellipse in a plane perpendicular to the propagation direction. Elliptical polarization results from the combination of two perpendicular → linearly polarized waves whose → phase difference is other than 0, 90, or 180°. The form of the ellipse is determined by the amplitudes of the component waves and the phase difference. → Linear polarization and → circular polarization can be considered as limiting cases of elliptical polarization.

elliptical; → polarization.

elliptically polarized light
  نور ِ قطبیده‌ی ِ بیضی‌گون   
nur-e qotbide-ye beyzigun

Fr.: lumière polarisée elliptiquement   

Light exhibiting → elliptical polarization.

elliptic; → polarized; → light.

ellipticity
  بیضیگی   
beyzigi

Fr.: ellipticité   

The degree of divergence of an ellipse from a circle.

From elliptic-, from elliptical + → -ity.

Beyzigi, from beyzi, → ellipse, + -igi, → -ity.

Elnath (β Tau)
  ناطح، شاخزن   
Nâteh (#), šâxzan (#)

Fr.: Alnath   

Same as → Alnath.

Alnath.

elongate
  درازیدن   
derâzidan

Fr.: allonger   

To draw out to greater length; lengthen; extend.

From L.L. elongatus "lengthened out," p.p. of elongare "to make longer, to remove to a distance," from → ex- "out" + longus "long;" PIE base *dlonghos- "long;" cf. Av. darəga-, darəγa- "long," drājištəm "longest;" Mod.Pers. derâz "long," dir "late; long;" Skt. dīrghá- "long (in space and time);" Gk. dolikhos "long;" P.Gmc. *langgaz (Ger. lang; O.N. langr; M.Du. lanc; Goth. laggs "long;" E. long).

DerâzidanDerâzeš "to elongate," from derâz "long," Mid.Pers. drâz "long;" Av. darəga-, darəγa- "long," drājištəm "longest;" PIE *dlonghos- "long," as above.

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