An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 1353

Fr.: supprimer   

1) To put down by authority or force.
2) To keep from public knowledge.
3) To restrain from a usual course or action. → suppression.

L. suppressus, p.p. of supprimere "to press down, stop, stifle," from → sub- "down, under" + premere "to press, push against," → express.

Nehâvidan, from ne-, → ni- "down, below," + hâvidan "to press," → express.


Fr.: suppression   

The act of suppressing; the state of being suppressed. → Compton suppression, → zero suppression.

suppress; → -tion.

  فراز، بالا، ابر-   
farâz, bâlâ, abar-

Fr.: supra-   

A prefix denoting "over, above, beyond, greater than."

From L. supra "above, over, before, beyond," → super-.

Farâz "above, up, upon," → height; bâlâ "above, up, high," → height; abar-, → super-.

supra-Eddington layer
  لایه‌ی ِ ابر-ادینگتونی   
lâye-ye abar-Eddingtoni

Fr.: couche super-eddingtonienne   

In some stellar models, particularly for evolved → massive stars, such as → red supergiants, → Luminous Blue Variables, and → Wolf-Rayet stars, an outermost layer of the stellar envelope where the luminosity might exceed the → Eddington limit. This is due to the → opacity peak produced by the variation in the ionization level of hydrogen in the outer → convective envelope, beneath the surface, of very luminous stars. The opacity peak generates supra-Eddington layers and density inversion. The high opacity decreases the Eddington luminosity in these layers, possibly to fainter levels than the actual stellar luminosity. As a result, the → radiative acceleration exceeds the → gravitational acceleration leading to → mass loss enhancement (see, e.g., A. Maeder, Physics, Formation and Evolution of Rotating Stars, Springer, 2009).

supra-; → Eddington limit; → layer.

supra-horizontal branch star
  ستاره‌ی ِ فراز ِ شاخه‌ی ِ افقی   
setâre-ye farâz-e šâxe-ye ofoqi

Fr.: étoile au-dessus de la branche horizontale   

A member of a rare class of objects found in → globular clusters to lie about one magnitude above and to the blue part of the → horizontal branch. These stars are identified as post → EHB stars on their way from to the → asymptotic giant branch.

supra-; → horizontal; → branch; → star.


Fr.: suprême   

1) Highest in rank or authority.
2) Of the highest quality, degree, character, importance, etc.

M.E., from M.Fr. suprême, and directly from L. supremus "highest," superlative of superus "situated above," from super "above," → super-.

Abartom "highest," from abar "high, upon," → super-, + -tom superlative suffix, → extreme.

  بر-، ابر-، رو-   
bar-, abar-, ru-

Fr.: sur-   

A prefix meaning "over, above, beyond, in addition," occurring mainly in loanwords from Fr.

From O.Fr. sour-, sor-, sur-, from L. → super-.

Bar-, abar-, → super-; ru-, ruy- "face, surface; aspect; appearance," variant rox (Mid.Pers. rôy, rôdh "face;" Av. raoδa- "growth," in plural form "appearance," from raod- "to grow, sprout, shoot;" cf. Skt. róha- "rising, height").


Fr.: sûr   

Free from doubt as to the reliability, character, action, etc., of something (

M.E. sur(e), from M.Fr. sur, O.Fr. seur "safe, secure; trustworthy," from L. securus "free from care, untroubled, safe," from *se cura, from se "free from" + cura "care."

Tenz, from (Fine-e Bandar Abbâs) tenz "firm, fixed, solid," variant tereng; (Tabari) tereng, təreq "firm, fixed;" (Baxtiyâri) teng "firm;" cf. Baluci tranj-, dranjit, tranjit/drannj-, draht, dratk "to hang up;" ultimately from Proto-Ir. *dra(n)j- "to fix, fasten, hold;" Av. drənj- (draž-) "to fix, fasten, hold;" Parthian (*abi-) 'bdrynj- "to be sure, secure; make certain;" Khotanese drys- "to hold;" cognate with Gk. drassomai "I hold (with the hand), take;" O.Irish dringid "he climbs;" M.Welsh dringo "to climb;" PIE *dregh- "to hold, fasten."


Fr.: sûrement   

Without doub; certainly; to be sure; for sure.

sure; → -ly.


Fr.: caution, garantie, sureté   

1) Security against loss or damage or for the fulfillment of an obligation, the payment of a debt, etc.; a pledge, guaranty, or bond.
2) The state or quality of being sure (

M.E. surte, from M.Fr., from O.Fr. seurte "a promise, pledge, guarantee; assurance, confidence;" from L. securitas "freedom from care or danger, safety," from securus, → secure.

ruyé (#)

Fr.: surface   

1) The outer face, outside, or exterior boundary of a thing; outermost or uppermost layer or area.
2) Math.: An infinite aggregate of points constituting space of two dimensions; part or all of the boundary of a solid.

sur-; → face.

surface brightness
  درخشندگی ِ رویه، ~ رویه‌ای   
deraxandegi-ye ruyé, ~ ruye-yi

Fr.: brillance de surface   

The brightness of an extended object, such as a planet, nebula, galaxy, or the sky background, expressed as magnitudes per unit area (usually square arc second). Surface brightness is calculated by dividing the object's magnitude by its size (→ isophotal radius).

surface; → brightness.

surface current
  جریان ِ رویه‌ای   
jarayân-e ruye-yi

Fr.: courant de surface   

A current whose core of maximum velocity is near the surface.

surface; → current.

surface density
  چگالی ِ رویه‌ای   
cagâli-ye ruye-yi

Fr.: densité de surface   

The amount of a quantity distributed over a surface area divided by the area, such as a surface-charge density.

surface; → density.

surface gravity
  گرانی ِ رویه، ~ رویه‌ای   
gerâni-ye ruyé, ~ ruye-yi

Fr.: gravité de surface   

1) The rate at which a small object in free fall near the surface of a body is accelerated by the gravitational force of the body: g = GM / R2, where G is the gravitational constant, and M and R are the mass and radius of the object. The surface gravity of Earth is equal to 980 cm s-2.
2) → black hole surface gravity.

surface; → gravity.

surface of last scattering
  رویه‌ی ِ واپسین پراکنش   
ruye-ye vâpasin parâkaneš

Fr.: surface de dernière diffusion   

Same as → last scattering surface.

surface; → last; → scattering.

surface temperature
  دما‌ی ِ رویه، ~ رویه‌ای   
damâ-ye ruyé, ~ ruye-yi

Fr.: température de surface   

1) For a star, same as → effective temperature.
2) Meteo.: The air temperature at or near the earth's surface.

surface; → temperature.

surface tension
  تنش ِ رویه‌ای   
taeš-e ruye-yi

Fr.: tension superficielle   

The inward → attraction of the → molecules at the → surface of a → liquid. The reason is that the molecules at the surface do not have other like molecules on all sides of them and consequently they cohere more strongly to those directly associated with them on the surface. Also called surface energy and capillary forces.

surface; → tension.


Fr.: surge   

Electricity: A sudden rush or burst of current or voltage.
Sun: A jet of material from an active region that reaches coronal heights and then either fades or returns into the chromosphere along the trajectory of ascent.

From M.Fr. sourgir "to rise, swell," from L. surgere "to rise, spring out" from → sub- "up from below" + regere "to keep straight, guide," cognate with Pers. râst, → right.

Boruntâz, from borun "out, the outside," → out, + tâz present stem of tâxtan, tâzidan "to run; to hasten; to assault" (Mid.Pers. tak "assault, attack;" Av. taka- "leap, run," from tak- "to run, flow;" cf. Skt. tak- "to rush, to hurry," takti "runs;" O.Ir. tech- "to flow;" Lith. teketi "to walk, to flow;" O.C.S. tešti "to walk, to hurry;" Tokharian B cake "river;" PIE base *tekw- "to run; to flow").


Fr.: surjection   

A mapping f of a set A onto a set B in such a way that every b element of B is the image of at least one element a of A. In other words, for any element b of B, the equation f(a) = b yields at least one solution. Allso called → surjective mapping.

From → sur- + → injection.

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