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: 13048 Search : far
optimization
  بهینش، بهین‌سازی   
behineš, behinsâzi

Fr.: optimalisation   

General: The fact of optimizing. The condition of being optimized. → optimize.
Computer science: Improving a system to reduce runtime, bandwidth, memory requirements, or other property of a system.

Verbal noun of → optimize

optimize
  بهینیدن، بهین ساختن   
behinidan, behin sâxtan

Fr.: optimiser   

General: To make as effective, perfect, or useful as possible.
Math.: To determine the maximum or minimum values of a specified function by systematically choosing the values of the variables from within an allowed set.

From opti(mum), → optimum, + → -ize.

Behinidan, from behin, → optimum, + -idan infinitive suffix. Behin sâxtan compound verb from behin + sâxtan, sâzidan "to build, make, fashion; to adapt, adjust, be fit" (from Mid.Pers. sâxtan, sâz-, Manichean Parthian s'c'dn "to prepare, to form;" Av. sak- "to understand, to mark," sâcaya- (causative) "to teach").

optimizer
  بهین‌ساز   
behinsâz

Fr.: optimiseur   

In computer science, a program that optimizes the speed or resource utilization. → optimize.

Agent noun of → optimize.

optimum
  بهینه   
behiné (#)

Fr.: optimum   

The best or most favorable point, degree, amount, etc. The greatest degree or best result obtained or obtainable under specific conditions.

From L. optimum, neuter singular of optimus "best" (used as a suppletive superlative of bonus "good").

Behiné, from behin superlative of beh "good, fine" (Mid.Pers. veh "better, good;" O.Pers. vahav-, vahu-; Av. vah-, vohu- "good;" cf. Skt. vasu- "good;" Hittite wasu-; Gaulish vesus "good") + -in superlative suffix + nuance suffix.

option
  اپتش، گزینه   
opteš, goziné (#)

Fr.: optesh   

1) The power or right of choosing.
2) Something that may be or is chosen; choice.
3) The act of choosing (Dictionary.com).

opt; → -tion.

optional
  اپتشی، گزینه‌ای   
opteši, gozine-yi

Fr.: optesh   

Left to one's choice; not required or mandatory (Dictionary.com).

option; → -al.

optometer
  دیدسنج   
didsanj (#)

Fr.: optomètre   

Any of various instruments for measuring refractive errors of the eye.

From opto- "vision; eye; optis," combining form from Gk. optos "seen, visible," from opsesthai "be going to see," related to ops "eye;" → -meter.

Did, → vision; -sanj, → -meter.

or
  یا   
yâ (#)

Fr.: ou   

A → conjunction word used to indicate alternatives.

M.E., from or, adverb "early, before," from Old Norse ār akin to O.E. ær "early."

, from Mid.Pers. ayâb, aviâp "or;" cf. P.Pers. ada, Av. adā, aδa "then."

orange
  نارنجی   
nârenji (#)

Fr.: orange   

1) A globose berry with a yellowish to reddish-orange rind and a sweet edible pulp.
2) Any of a group of colors that are between red and yellow in hue (Merriam-Webster.com).

M.E., from O.Fr. orange, orenge, from M.L. pomum de orenge, from It. arancia, originally narancia, alteration of Ar. nâranj, from Pers. nârang, from Skt. narangah "orange tree."

Nârenji, from nârenj "orange," as above.

orbit
  مدار   
madâr (#)

Fr.: orbite   

The path followed by a body moving in a gravitational field. For bodies moving under the influence of a centrally directed force, without significant perturbation, the shape of the orbit must be one of the conic section family of curves (circle, ellipse, parabola, or hyperbola).

L. orbita "wheel track, course, circuit."

Madâr, from Ar.

orbit decay
  تباهیِ مدار   
tabâhi-ye madâr

Fr.: déclin d'orbite   

A gradual change in the orbit of a spacecraft caused by aerodynamic drag of a planet's outer atmosphere and other forces.

orbit; → decay.

orbital
  ۱) مداری؛ ۲) مدارال   
1) madâri; 2) madârâl

Fr.: 1) orbital; 2) orbitale   

1) Of or relating to an orbit.
2) A wave function that describes the state of an electron with a given energy (n, l, and ml quantum numbers) in an atom (atomic orbital) or in a molecule (molecular orbital).

Orbital, from → orbit + → -al.

orbital angular momentum
  جنباک ِ زاویه‌ای ِ مداری   
jonbâk-e zâviyeyi-ye madâri

Fr.: moment cinétique orbital, ~ angulaire ~   

1) Mechanics: The → angular momentum associated with the motion of a particle about an origin, equal to the cross product of the position vector (r) with the linear momentum (p = mv): L = r x p. Although r and p are constantly changing direction, L is a constant in the absence of any external force on the system. Also known as orbital momentum.
2) Quantum mechanics: The → angular momentum operator associated with the motion of a particle about an origin, equal to the cross product of the position vector with the linear momentum, as opposed to the → spin angular momentum. In quantum mechanics the orbital angular momentum is quantized. Its magnitude is confined to discrete values given by the expression: ħ &radic l(l + 1), where l is the orbital angular momentum quantum number, or azimuthal quantum number, and is limited to positive integral values (l = 0, 1, 2, ...). Moreover, the orientation of the direction of rotation is quantized, as determined by the → magnetic quantum number. Since the electron carries an electric charge, the circulation of electron constitutes a current loop which generates a magnetic moment associated to the orbital angular momentum.

orbital; → angular; → momentum.

orbital axis
  آسه‌ی ِ مداری   
âse-ye madâri

Fr.: axe orbital   

The → perpendicular to the → orbital plane.

orbital; → axis.

orbital debris
  تیفالِ مداری   
tifâl-e madâri

Fr.: débris spatial   

Objects in orbit around Earth created by humans, that no longer serve any useful purpose. They consist of everything from entire spent rocket stages and defunct satellites to explosion fragments, paint flakes, dust, and slag from solid rocket motors, and other small particles. Also called space junk and space waste.

orbital; → debris .

orbital electron
  الکترونِ مداری   
elektron-e madâri (#)

Fr.: électron orbital   

An electron contained within an atom which may be thought of as orbiting around the nucleus, in a manner analogous to the orbit of a planet around the Sun.

orbital; → electron .

orbital element
  بُن‌پارِ مداری   
bonpâr-e madâri

Fr.: élément orbital   

Any of the six parameters needed to specify the → orbit of an object around a → primary body (such as a planet around the Sun or a satellite around the Earth) and give its position at any instant. Two of them define the size and the form of the orbit: → semi-major axis (a) and → eccentricity (e). Three angular values determine the orbit position in space: the → inclination (i) of the object's → orbital plane to the reference plane (such as the → ecliptic), the → longitude of ascending node (Ω), and the → argument of periapsis (ω). And finally the sixth element is the → time of periapsis passage which allows calculating the body's position along the orbit at any instant.

orbital; → element.

orbital energy
  کاروژِ مداری   
kâruž-e madâri

Fr.: énergie orbitale   

The → sum of the → potential energy and the → kinetic energy of an object in → orbit.

orbital; → energy.

orbital inclination
  درکیلِ مداری   
darkil-e madâri

Fr.: inclinaison orbitale   

An → orbital element that defines the angle between the orbital plane of a solar system body (planet, comet, asteroid) and the plane of the ecliptic. The orbital inclination of the Earth's orbit is 0°; those of Mercury, Venus, and Mars are 7.01°, 3.39°, and 1.85° respectively.

orbital; → inclination .

orbital maneuver
  مانوور ِ مداری   
mânovr-e madâri

Fr.: mainoeuvre orbitale   

The moving of a spacecraft between two different orbits resulting from a change in its velocity (acceleration). Generally, manoeuvres are caused by → thrust from the spacecraft's motors.

orbital; → maneuver.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit cla clo clo clu Coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima Ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad ran rar ray rea rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>