An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>

Number of Results: 12948 Search : far
Nyquist frequency
  بسامد ِ نیکویءیست   
basâmad-e Nyquist

Fr.: fréquence de Nyquist   

The highest frequency that can be determined in a Fourier analysis of a discrete sampling of data.

Nyquist formula; → frequency.

Nyquist-Shannon sampling theorem
  فربین ِ نمونان‌گیری ِ نیکویءیست-شانون   
farbin-e nemunân-giri-ye Nyquist-Shannon

Fr.: théorème d'échantillonnage de Nyquist-Shannon   

The minimum number of resolution elements required to properly sample a signal, such as a star image, without causing erroneous effects known as aliasing. For electronic imaging, this number is generally taken as 2 pixels across the seeing disk diameter at the half intensity points. Also called → Shannon's sampling theorem and → sampling theorem.

Named after Harry Nyquist (1889-1976), a Swedish-born American physicist, who made important contributions to information theory, and Claude Elwood Shannon (1916-2001), an American mathematician and pioneer of information theory; → theorem.

O star
  ستاره‌ی ِ O   
setâre-ye O (#)

Fr.: étoile de type O   

A luminous, hot, blue star whose spectrum is dominated by the lines of hydrogen, atomic helium, and ionized helium; also known as O-type star. This is the earliest → spectral type and the only → main sequence star in which ionized helium is present. The → effective temperatures of these stars range from about 30,000 K to 50,000 K, their luminosities from 50,000 to 1,000,000 times that of → solar luminosity, and their masses from about 20 to 100 → solar masses. The hottest O-type stars display high ionization emission features such as N III and He II, → Of star. They are divided into subtypes O2, the hottest, to O9.7, the coldest. O-type stars are relatively rare, for each star of 100 solar masses there are 106 stars of solar mass. They are relatively short-lived since they spend only a few million years on the main sequence. The brightest O-type star in the sky visible with naked eye is → Alnitak. For prominent Galactic O stars see → HD 93129.

O, letter of alphabet used in the Harvard spectral classification; → star.

O-point
  نقطه‌ی ِ O   
noqte-te O

Fr.: point O   

The circular configuration of magnetic field lines around a → magnetic null point. See also → X-point.

O, the round letter of alphabet; → point.

O-type star
  ستاره‌ی ِ گونه‌ی ِ O   
setâre-ye gune-ye O

Fr.: étoile de type O   

Same as → O star.

O, letter of alphabet used in the → Harvard classification; → type; → star.

OB association
  آهزش ِ OB   
âhazeš-e OB

Fr.: association OB   

A loosely bound grouping of O and B stars that typically stretches up to several hundred → light-years and may contain between a dozen and several hundred → O stars and → B stars. The members of an OB association are young and of roughly the same age. OB associations dissipate in a few tens of millions of years.

O and B, from spectral types; → association.

OB star
  ستاره‌ی ِ OB   
setâre-ye OB

Fr.: étoile OB   

A collective designation for massive O and B stars.

O star; → B star.

OB subdwarf (sdOB)
  زیر-کوتوله‌ی ِ OB   
zir-kutule-ye OB

Fr.: sous-naine OB   

A hot star belonging to one of the two groups of → EHB stars or → pre-WD stars.

OB star; → subdwarf.

OBC star
  ستاره‌ی ِ OBC   
setâre-ye OBC

Fr.: étoile OBC   

A → carbon (C)-rich → O-type or → B-type star.

O star; → B star; → carbon; → star.

obelus
  نشانه‌ی ِ بخش   
nešâne-ye baxš

Fr.: obélus   

The symbol ÷ used to indicate → division. This symbol was first used as a → division sign by Johann Rahn (or Rhonius) (1622-1676) in 1659 in Teutsche Algebra.

From Gk. obelus "sharpened stick, spit, pointed pillar," related to obelisk, originally used in ancient manuscripts to mark passages that were suspected of being corrupted, doubtful, or spurious.

division sign.

Oberon
  ا ُبرون   
Oberon (#)

Fr.: Oberon   

The outermost of Uranus' large satellites and the second largest. It has a diameter of 523 km and orbits 583,420 km from its planet. Compared to Uranus' moons Ariel, Titania, and Miranda, Oberon is heavily cratered. Like all of Uranus' large moons, Oberon is composed of roughly half ice and half rock. Oberon was discovered by Herschel in 1787.

Oberon is the King of the Fairies and husband of Titania in Shakespeare's Midsummer-Night's Dream.

object
  ۱، ۲، ۳، ۴، ۵، ۶) بر‌آخت؛ ۷) کندار   
1, 2, 3, 4, 5, 6) barâxt; 7) kondâr

Fr.: objet   

1) General: Anything that is visible or tangible.
2) Physics: A collection of masses, taken to be one.
3) Optics: The collection of points that acts as a source of light rays for an optical system.
4) Astro.: A general designation for material bodies studied in this science.
5) Math.: Anything that could be formally defined, and with which one may do deductive reasoning and mathematical proofs. → mathematical object
6) Computer science: A free standing chunk of code that defines the properties of some thing.
7) Grammar: In English grammar, a noun, noun phrase, or pronoun that is affected by the action of a verb (a direct object or an indirect object) or that completes the meaning of a preposition (the object of a preposition).

From M.L. objectum "thing thrown down or put before" (the mind or sight), neutral of objectus, p.p. of obicere "to present, oppose, cast in the way of," from ob "against" + jacere "to throw," from PIE base *ye- "to do" (cf. Gk. iemi, ienai "to send, throw," Hitt. ijami "I make").

Barâxt "thing drawn against, before" from bar- + âxt. The prefix bar- "on; upon; against; before; at; in," from Mid.Pers. abar, O.Pers. upariy "above; over, upon, according to," Av. upairi "above, over" (upairi.zəma- "located above the earth"), cf. Gk. hyper- "over, above," L. super-, O.H.G. ubir "over;" PIE base *uper "over".
The second component âxt, contraction of âxté, p.p. of âxtan, variants âhixtan, âhiz- "to draw (a sword)," âhanjidan "to draw up, pull, extract," Mid.Pers. âhixtan, âhanjitan "to draw out, pull up, extract," Av. θanj- "to draw, pull, drive;" Proto-Iranian *θanj-.
Kondâr, literally "action receiver," from kon- present stem of kardan "to do, make," → -or, used as action noun (like xor, xâb, foruš), + dâr agent noun from dâštan "to receive" (Dehxodâ), originally "to have, hold, possess," → property.

object glass
  بر‌آختی   
barâxti

Fr.: objectif   

The → lens or lenses in the → object end of the body tube of a → microscope, by means of which the rays coming from the object examined are brought to a focus. Same as → objective. An old term for the → objective lens of a → refracting telescope.

object; → glass.

object language
  زبان ِ بر‌آخت   
zabân-e barâxt

Fr.: langue objet   

Any language described by a → metalanguage. For example, the sentence "In Persian, the word setâré means "star" " is part of a metalanguage (here, English), and the language described (namely Persian) is an object language. Metalanguage and object language may be identical.

object; → language.

object space
  فضای ِ بر‌آخت   
fazâ-ye barâxt

Fr.: espace objet   

In an → optical system, the space between the object being viewed and the → entrance pupil. See also → image space.

object; → space.

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).

objective
  ۱، ۲، ۳) بر‌آختی؛ ۴) کنداری   
1, 2, 3) barâxti; 4) kondâri

Fr.: objectif   

1a) Of or pertaining to something that can exist independent of thought or perception as part of reality. Opposite of → subjective.
1b) Free of any bias or prejudice caused by personal feelings.
2) The → lens or combination of lenses nearest the → object in an optical instrument ( → telescope, → microscope, → camera).
3) The → primary mirror of a → reflecting telescope.
4) Grammar: Relating to nouns, noun phrases, or pronouns that are the objects of verbs or prepositions.

Adjective of → object.

objective grating
  توری ِ بر‌آختی   
turi-ye barâxti

Fr.: réseau-objectif   

A diffraction grating placed over the aperture of a telescope in order to produce spectra of all the objects in the field of view.

objective; → grating.

objective lens
  عدسی ِ بر‌آختی   
adasi-ye barâxti

Fr.: lentille de l'objectif   

The lens or system of lenses in a → telescope or → microscope that magnify an object and project a larger → image. The object lens is nearest the object being viewed

objective; → lens.

objective prism
  منشور ِ بر‌آختی   
manšur-e barâxti

Fr.: prisme-objectif   

A dispersing prism placed in front of a telescope objective to produce spectra of all luminous objects in the field of view.

objective; → prism.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>