An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



<< < -ab ab- abo abs abs acc acc acr act ada adh Adr aer age Air Alf alg all alp alt ama amp ana ang ang ann ano ant ant apl Apo app Aqu arc arg arr ASC ass ast ast asy atm att aur aut axi > >>

Number of Results: 916
  آدوسنده، آدوسشی   
âdusandé, âduseši

Fr.: adhésif   

1) Of or pertaining to the molecular force → adhesion.
2) A substance used for sticking objects or materials together; glue.

Adjective from → adhere.

adhesive force
  نیروی ِ آدوسش   
niru-ye âduseš

Fr.: force adhésive   

The force of → attraction between molecules of different substances; for example, the force between the molecules of a solid and a liquid. When water is poured on clean glass, it tends to spread, forming a thin, uniform film over the surface. This is because the adhesive forces between water and glass are strong enough to pull the water molecules out of their spherical formation and hold them against the surface of the glass, thus avoiding the repulsion between like molecules.

adhesive; → force.


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."

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.


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."

  آبندیدن، آبنیدن   
âbandidan, âbanidan

Fr.: adjoindre   

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

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.

  آبند، آبن   
âband, âban

Fr.: adjoint   

Literally "joined to." → adjoint matrix.


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.


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 (

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.


Fr.: ajustement   

The act of adjusting.

Verbal noun of → adjust.


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 (

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.


Fr.: adoption   

The act of adopting. The state of being adopted.

adopt; → -tion.


Fr.: adoptif   

Of or involving adoption. Acquired or related by adoption.

adopt; → -ive.

<< < -ab ab- abo abs abs acc acc acr act ada adh Adr aer age Air Alf alg all alp alt ama amp ana ang ang ann ano ant ant apl Apo app Aqu arc arg arr ASC ass ast ast asy atm att aur aut axi > >>