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: 912
Adhil
  ذیل   
Zeyl

Fr.: Adhil   

A → late-type → giant star of → spectral type K0-IIIb in → Andromeda. Other designations: ξ (Xi) Andromedae, HR 390, and HD 8207. → Visual magnitude = 4.88, B - V = +1.08.

From Ar. Al-dhayl "skirt of a garment; tail."

adiabatic
  بی‌دررو   
bidarrow (#)

Fr.: adiabatique   

A → thermodynamic process that occurs without → loss or → gain of → heat.
See also: → adiabatic change, → adiabatic index, → adiabatic initial conditions, → adiabatic phase, → adiabatic process, → adiabatic shock, → adiabatic temperature gradient, → superadiabatic temperature gradient.

From Gk. adiabatos "impassable," from a- "not" + diabatos "passable," from diabainein "to go across," from dia- " through" + bainein "to go."

Bidarrow from bi- "not; without" + darrow "way out," from dar "out" + row "to go, going," from raftan "to go."

adiabatic change
  دگرشد ِ بی‌دررو، دگرش ِ ~   
degaršod-e bidarrow, degareš-e ~

Fr.: changement adiabatique   

A change taking place in a system that has perfect thermal insulation, so that heat cannot enter or leave the system and energy can only be transferred by work.

adiabatic; → change.

adiabatic index
  دیشن ِ بی‌دررو   
dišan-e bidarrow

Fr.: indice adiabatique   

Of a gas, the ratio of its → specific heat at constant pressure to its specific heat at constant volume: γ = CP/ CV.

adiabatic; → index.

adiabatic initial conditions
  بوتارهای ِ آغازین ِ بی‌دررو   
butârhâ-ye âqâzin-e bidarrow

Fr.: conditions initiales adiabatiques   

The assumption whereby the density fluctuations in the very → early Universe would be produced by compressing or decompressing of all components of a homogeneous Universe. The adiabatic initial conditions lead to coherent oscillations in the form of peaks in the → temperature anisotropy spectrum. See also → acoustic peak, → baryon acoustic oscillation.

adiabatic; → initial; → condition.

adiabatic phase
  فاز ِ بی‌دررو   
fâz-e bidarrow

Fr.: phase adiabatique   

Same as the → Sedov-Taylor phase.

adiabatic; → phase.

adiabatic process
  فراروند ِ بی‌دررو   
farâravand-e bidarrow

Fr.: processus adiabatique   

A → thermodynamic process in which no → heat is supplied to or rejected from a system. → polytropic process.

adiabatic, → process.

adiabatic shock
  تش ِ بی‌دررو   
toš-e bidarrow

Fr.: choc adiabatique   

A → shock wave without → radiative cooling. The term "adiabatic" refers to the fact that no → heat is removed during shock.

adiabatic; → shock.

adiabatic temperature gradient
  زینه‌ی ِ دمای ِ بی‌دررو   
zine-ye damâ-ye bidarrow

Fr.: gradient de température adiabatique   

The temperature gradient defining the → radiative equilibrium condition in a region. It is expressed as: dT/dr = (1 - 1/ γ)((T / P)(dP / dr), where T and P are temperature and pressure, dT / dr and dP / dr temperature and pressure gradients respectively, and γ = CP / CV. For radiative equilibrium to be stable against → convection, the actual temperature gradient must be less than the adiabatic temperature gradient, i.e. |dT /dr|rad < |dT /dr|ad. See also → Schwarzschild's criterion.

adiabatic; → temperature; → gradient.

adjective
  زابه   
zâbé

Fr.: adjectif   

In grammar, a word that qualifies, describes, or quantifies a noun.

M.E., from O.Fr. adjectif, from L. adjectivum "that is added to (the noun)," neuter of adjectivus "added," from p.p. of adicere "to throw or place (a thing) near," from → ad- "to" + iacere "to throw," → jet.

Zâbé, from zâb "attribute, quality" (Dehxodâ); probably related to zib "beauty, adornment," zibâ "beautiful, adorned," zivar "ornament," zab "easy; gratis; right, direct;" from Proto-Ir. *zai- "to adorn, to equip."

adjoin
  آبندیدن، آبنیدن   
âbandidan, âbanidan

Fr.: adjoindre   

1) To be close to or in contact with.
2) To attach or append (dictionary.com).

M.E., from O.Fr. ajoindre"join together, unite," from L. adjungere "fasten on, harness, join to," from → ad- "to" + jungere "to bind together," cognate with → yoke.

Âbandidan, âbanidan, from prefix â- + band, vand, bastan, in dialects contracted to ban-, van- "to bind, attach," → band, + -idan infinitive suffix.

adjoint
  آبند، آبن   
âband, âban

Fr.: adjoint   

Literally "joined to." → adjoint matrix.

adjoin.

adjoint matrix
  ماتریس ِ آبن   
mârtis-e âban

Fr.: matrice adjointe   

The → transpose of a → matrix in which each → element is replaced by its → cofactor. Same as → conjugate transpose and → Hermitian conjugate.

adjoint; → matrix.

adjust
  جوتیدن   
jutidan

Fr.: ajuster   

1) To change (something) so that it fits, corresponds, or conforms; adapt; accommodate.
2) To put in good working order; regulate; bring to a proper state or position (dictionary.com).

M.E. ajusten, "to correct, remedy; arrange, settle, compose," from M.Fr. adjuster, O.Fr. ajouter "to join," from L.L. adjuxtare "to bring near," from L. → ad- "to" + juxta "next," related to jungere "to join," from PIE *yeug- "to join," → conjugate, akin to E. → yoke.

Jutidan, from Kurd. Soriani jut, jot "pair, couple, twin," Aftari jot "yoke," classical Pers. yuq, → yoke.

adjustment
  جوتش   
juteš

Fr.: ajustement   

The act of adjusting.

Verbal noun of → adjust.

adopt
  بر‌اپتیدن   
baroptidan

Fr.: adopter   

1) To choose or take as one's own; make one's own by selection or assent.
2) To take and rear (the child of other parents) as one's own child, specifically by a formal legal act.
3) To vote to accept (Dictionary.com).

M.E., from M.Fr. adopter, from L. adoptare, from → ad- + optare, → opt.

Baroptidan, on the model of bargozidan "to choose," from bar- "on, up, upon, in," → on-, + optidan, → opt.

adoption
  بر‌اپتش   
baropteš

Fr.: adoption   

The act of adopting. The state of being adopted.

adopt; → -tion.

adoptive
  بر‌اپتشی   
baropteši

Fr.: adoptif   

Of or involving adoption. Acquired or related by adoption.

adopt; → -ive.

Adrastea
  ادرستیءا   
Adrasteâ (#)

Fr.: Adrastée   

The second innermost known satellite of Jupiter, whose orbit is situated at a distance of about 129 000 km from the planet, and its orbital period is of 0.298 days; also known as Jupiter XV. Adrastea is 25 x 20 x 15 km in size.

In Gk. mythology, Adrastea was the daughter of Zeus and Ananke and the distributor of reward and punishments.

adsorb
  برشمیدن   
baršamidan

Fr.: adsorber   

To take up and hold another substance on the surface.

adsorption.

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