An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



Number of Results: 17 Search : -or
   -گر، -گار، -کار، -آر، -نده   
-gar (#), -gâr (#), -kâr (#), -âr (#), -andé (#)

Fr.: -eur   

A suffix forming agent nouns, occurring originally in loanwords from Anglo-French; it now functions in E. as an orthographic variant of -er.

From M.E., from O.Fr. -o(u)r, from L. or-, extracted from -tor; Gk. -tor (e.g. dotor "giver," genetor "begetter," ktistor "founder"); cf. Av. -tar- (dātar- "giver," astar- "thrower," baxtar- "tributor"); Skt. -tr- (kartr- "doer," dhātr- "founder," astr- "thrower").

Agent suffix -gar, variant -gâr, -kâr, from kar-, kardan "to do, to make" (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "makes;" cf. Skt. kr- "to do, to make;" krnoti "makes," karma "act, deed;" PIE base kwer- "to do, to make"). Suffix -âr, as in parastâr, xaridâr, foruxtâr, virâstâr, xâstâr, nemudâr. Agent suffix -andé, used with verbs.


Fr.: co-orbital   

Of or relating to two or more celestial bodies that share, or almost share, the same orbit.

co-; → orbital.

co-orbital motion
  جنبش ِ هم‌مداری   
jonbeš-e ham-madâri

Fr.: mouvement co-orbital   

The motion of two or more bodies around the Sun on different orbits when it takes them the same amount of time to complete one revolution. There are three possible types of co-orbital motions of a small body associated with a planet: → tadpole orbits, → horseshoe orbits, and → quasi-satellite orbits.

co-orbital; → motion.

co-orbital satellite
  ماهواره‌ی ِ هم‌مدار، بنده‌وار ِ ~   
mâhvâre-ye ham-madâr, bandevâr-e ~

Fr.: satellite co-orbital   

Any of satellites which either share the same orbit or which occupy immediately adjacent orbits that change periodically as the satellites approach one another (Ellis et al., 2007, Planetary Ring Systems, Springer).

co-orbital; → satellite.

  هم‌مداری؛ هم‌مدار   
ham-madâri; ham-madâr

Fr.: co-orbitage; c-orbitant, co-orbiteur   

The action or quality of a → co-orbiting asteroid.

From co- "together," → com- + → orbit + → -ing.

From ham- "together," → com- + madârorbit + -i noun suffix.

co-orbiting asteroid
  سیارک ِ هم‌مدار   
sayyârak-e ham-madâr

Fr.: astéroïde co-orbiteur   

An asteroid having a → co-orbital motion.

co-orbiting; → asteroid.


Fr.: désorbiter   

To cause a spacecraft to leave its operational orbit to enter a descent phase or to change course.

From → de- + → orbit.


Fr.: désorbitage   

Of a spacecraft, the act or process of departing from an operational orbit. → de-orbit.

Noun form of → de-orbit.

first-order differential equation
  هموگش ِ دگرسانه‌ای ِ رایه‌ی ِ نخست   
hamugeš-e degarsâne-yi-ye râye-ye naxost

Fr.: équation différentielle du premier ordre   

A → differential equation containing only the first → derivative. For example, dy/dx = 3x and 2y(dy/dx) + 3x = 5.

first; → order; → differential; → equation.

first-order logic (FOL)
  گوییک ِ فراسنی ِ رایه‌ی ِ نخست، ~ فراسنهای ِ ~ ~   
guyik-e farâsani-ye râye-ye naxost, ~ farâsanhâ-ye ~ ~

Fr.: logique des prédicats du premier ordre   

A system of → formal logic that is an extension of → propositional logic. It is also known as → first-order predicate calculus and → predicate logic. FOL eliminates deficiencies of propositional logic by: representing → objects (their properties, relations and statements about them), introducing → variables, and introducing → quantifiers.

first; → order; → predicate; → logic.

first-order partial derivative
  واخنه‌ی ِ پاری ِ رایه‌ی ِ نخست   
vâxane-ye pâri-ye râye-ye naxost

Fr.: dérivée partielle du premier degré   

For a → function with several → variables, the derivative, done only once, with respect to one of the variables. For example ∂u/∂x for u = u(x,y).

first; → order; → partial; → derivative.

first-order predicate calculus
  افماریک ِ فراسنی ِ رایه‌ی ِ نخست   
afmârik-e farâsani-ye râye-ye naxost

Fr.: cacul des prédicats du premier ordre   

Same as → first-order logic.

first; → order; → predicate; → calculus.

first-order spectrum
  بیناب ِ رایه‌ی ِ نخست   
binâb-e râye-ye naxost

Fr.: spectre du premier ordre   

An optical spectrum, produced by a diffraction grating, in which the difference in path length of light from adjacent slits is one wavelength.

first; → order; → spectrum.

object-oriented programming
  برنامه‌سازی ِ بر‌آخت‌گرا   
barnâme-sâzi-ye barâxt-gerâ

Fr.: programme orienté objet   

In computer science a programming technique that uses → objects and their interactions to design applications and programs.

object; oriented, p.p. from the verb of → orientation; → programming.

Barnâme-sâzi, → programming; barâxt, → object; gerâ agent adj. of gerâyidan "to incline toward; to intend; to make for." The stem gerâ may be a variant of Mod.Pers. kil "bent, inclined" (k/g and l/r interchanges), from PIE base *klei- "to lean, incline," cognate with L. clinare "to bend" (E. declination, inclination, etc.), Gk. klinein "to cause to slope, slant, incline," Skt. sri- "to lean," O.Pers. θray-, Av. sray- "to lean," P.Gmc. *khlinen (Ger. lehnen, E. lean).

second-order logic
  گوییک ِ رایه‌ی ِ دوم   
guyik-e râye-ye dovom

Fr.: logique du seconde ordre   

An n extension of → first-order logic that quantifies not only → variables that range over → individuals, but also quantifies over → relations.

second; → order; → predicate; → logic.

spin-orbit coupling
  جفسری ِ اسپین-مدار، جفتش ِ ~   
jafsari-ye espin-madâr, jofteš-e ~

Fr.: couplage spin-orbite   

1) Astro.: A relationship between the orbital period of one body around another and its rotational period on its axis. The relationship results from tidal forces between the two bodies. For example, the rotation period of the Moon equals its revolution period around the Earth.
2) Quantum mechanics: The interaction between a particle's → spin angular momentum and its → orbital angular momentum.

spin; → orbit; → coupling.

well-ordered set
  هنگرد ِ خوش‌رایه   
hangard-e xoš-râyé

Fr.: ensemble bien ordonné   

A set in which every → nonempty → subset has a minimum element.

well; → order; → set.