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: 220
wavefront sensor
  حسگر ِ پیشان ِ موج   
hessgar-e pišân-e mowj

Fr.: analyseur de front d'onde   

In adaptive optics, a device that analyzes the light sample coming from the wavefront and determines the error in each part of the beam. The wavefront sensor used in adaptive optics is a → Shack-Hartmann type, which works in conjunction with a deformable mirror.

wavefront; → sensor.

wavefront tilt
  گرای ِ پیشان ِ موج   
gerâ-ye pišân-e mowj

Fr.: inclinaison du front d'onde   

The average slope in both the X and Y directions of a → wavefront or phase profile across the pupil of an optical system.

wavefront; → tilt.

waveguide
  موج‌بر   
mowjbar (#)

Fr.: guide d'ondes   

Any transmission medium, such as a hollow metal conductor, coaxial cable, or glass fiber, capable of confining and supporting the propagation of electromagnetic waves regardless of wavelength or mode of propagation.

wave; guide, M.E., from O.Fr. guider "to guide, lead," from Frankish *witan "show the way," from P.Gmc. *wit- "to know" (cf. Ger. weisen "to show, point out," wissen "to know;" O.E. witan "to see"). Cognate with Pers. bin- "to see" (present stem of didan "to see"); Mid.Pers. wyn-; O.Pers. vain- "to see;" Av. vaēn- "to see;" Skt. veda "I know;" Gk. oida "I know," idein "to see;" L. videre "to see;" PIE base *weid- "to know, to see."

Mowjbar, from mowj, → wave, + -bar "carrier," from bordan "to carry, lead" (Mid.Pers. burdan, O.Pers./Av. bar- "to bear, carry," barəθre "to bear (infinitive)," Skt. bharati "he carries," Gk. pherein, L. fero "to carry;" PIE base *bher- "to carry").

wavelength
  طول ِ موج، موج-طول   
tul-e mowj (#), mowj-tul (#)

Fr.: longueur d'onde   

The distance between two successive points in the wave that are characterized by the same phase of oscillation; e.g. → de Broglie wavelength; → Compton wavelength; → blaze wavelength; → peak wavelength; → center wavelength; → central wavelength; → cutoff wavelength.

wave; → length.

wavelet
  موجک   
mowjak

Fr.: ondelette   

A small wave; ripple.

wave + -let a diminutive suffix.

wavelet theory
  نگره‌ی ِ موجک   
negare-ye mowjak

Fr.: théorie des ondolettes   

A refinement of → Fourier analysis which enables to simplify the description of a complicated function in terms of a small number of coefficients. The formal history of wavelet theory began in the early 1980s when Jean Morlet, a French geophysicist, introduced the concept of wavelet and studied wavelet transform as a new tool for scientific signal analysis. In 1984, his collaboration with Alex Grossmann yielded a detailed mathematical study of the continuous wavelet transforms and their various applications. Although similar results had already been obtained 20-50 years earlier by several other researchers, the rediscovery of the old concepts provided a new method for decomposing functions.

wavelet; → theory.

wax
  موم   
mum (#)

Fr.: cire   

1) A substance that is secreted by bees and is used by them for constructing the honeycomb, that is a dull yellow solid plastic when warm, and that is composed of a mixture of esters, cerotic acid, and hydrocarbons; called also beeswax.
2) Any of various substances resembling the wax of bees (Merriam-Webster.com).

M.E. waxen, O.E. weaxan; cognate with Du. was, Ger. Wachs.

Mum "wax; wax-candle."

waxing
  فزاینده   
fazâyandé (#)

Fr.: montant   

Increasing in extent, quantity, intensity, power, etc.

Waxing, from wax, from M.E. wax "to grow bigger, greater;" O.E. weaxan "to increase, grow;" cf. O.H.G. wahsan, O.N. vaxa, Du. wassen, Ger. wachsen "to grow, increase;" cognate with Mid.Pers. waxš-, waxšidan "to grow;" Av. xaxš- "to grow," xaxša- "growth;" Skt. vaks- "to grow, become big;" Gk. auxein "to increase."

Fazâyandé "waxing, incresing," from fozudan, variant of afzudan "to add, increase" (Mid.Pers. abzudan "to increase, grow;" O.Pers. abijav- "to increase, add to, promote," from abi-, aiby- "in addition to; to; against" + root jav- "press forward;" Av. gav- "to hasten, drive;" Sk. jav- "to press forward, impel quickly, excite," javate "hastens").

waxing crescent
  هلال ِ فزاینده، برن ِ ~   
helâl-e fazâyandé, barn-e ~

Fr.: croissant montant   

The phase of the Moon between the → new moon and the → first quarter.

waxing; → crescent.

waxing gibbous
  کوژماه ِ فزاینده   
kužmâh-e fazâyandé

Fr.: lune gibbeuse montante   

The oval shape of the Moon a few days after the → first quarter.

waxing; → gibbous.

waxing moon
  ماه ِ فزاینده   
mâh-e fazâyandé (#)

Fr.: lune montante   

The circumstance when the phase of the Moon is increasing from → new moon to → full moon.

waxing; → moon.

way
  راه   
râh (#)

Fr.: voie, chemin   

A road, track, or path.

M.E. wei(gh)e, wai, from O.E. weg "road, path;" cf. Du. weg, O.H.G. weg, Ger. Weg, Goth. wigs "way;" PIE base *wegh- "to move."

Râh "way, path" (from Mid.Pers. râh, râs "way, street," also rah, ras "chariot;" from Proto-Iranian *rāθa-; cf. Av. raθa- "chariot;" Skt. rátha- "car, chariot," rathyā- "road;" L. rota "wheel," rotare "to revolve, roll;" Lith. ratas "wheel;" O.H.G. rad; Ger. Rad; Du. rad; O.Ir. roth; PIE *roto- "to run, to turn, to roll");

WC Wolf-Rayet
  وُلف-رایه‌ی ِ WC   
Wolf-Rayet-e WC

Fr.: Wolf-Rayet WC   

A → Wolf-Rayet star whose spectrum is dominated by emission lines of ionized carbon: C III 5696 Å, C III / C IV 4650 Å, C IV 5801-12 Å. This type is divided in sub-types WC4 to WC9.
For theoretical models, a Wolf-Rayet star whose carbon abundance at surface is larger than nitrogen abundance and has the abundance ratio (C + O) / He < 1 (in number).

W short for Wolf-Rayet star, C for → carbon.

WC4 star
  ستاره‌ی WC4   
setâre-ye WC4

Fr.: étoile WC4   

A → WC Wolf-Rayet that its spectrum shows the following emission line characteristics: strong C IV 5801-12 Å, weak or absent C II 4267 Å, and moderate O V 5572-98 Å.

W, from → Wolf-Rayet; C, from → carbon; → star.

WC5 star
  ستاره‌ی WC5   
setâre-ye WC5

Fr.: étoile WC5   

A → WC Wolf-Rayet whose spectrum shows the following emission line characteristics: C III 5696 Å very weaker than C IV 5801-12 Å and C III weaker than O V 5572-98 Å.

W, from → Wolf-Rayet; C, from → carbon; → star.

WC6 star
  ستاره‌ی WC6   
setâre-ye WC6

Fr.: étoile WC6   

A → WC Wolf-Rayet whose spectrum shows the following emission line characteristics: C III 5696 Å very weaker than C IV 5801-12 Å and C III stronger than O V 5572-98 Å.

W, from → Wolf-Rayet; C, from → carbon; → star.

WC7 star
  ستاره‌ی WC7   
setâre-ye WC7

Fr.: étoile WC7   

A → WC Wolf-Rayet with a spectrum shows the following emission line characteristics: C III 5696 Å weaker than C IV 5801-12 Å and C III very stronger than O V 5572-98 Å.

W, from → Wolf-Rayet; C, from → carbon; → star.

WC8 star
  ستاره‌ی WC8   
setâre-ye WC8

Fr.: étoile WC8   

A → WC Wolf-Rayet with a spectrum shows the following emission line characteristics: C III 5696 Å stronger than C IV 5801-12 Å, C II 4267 Å absent, and O V 5572-98 Å weak or absent.

W, from → Wolf-Rayet; C, from → carbon; → star.

WC9 star
  ستاره‌ی WC9   
setâre-ye WC9

Fr.: étoile WC9   

A → WC Wolf-Rayet whose spectrum shows the following emission line characteristics: C III 569 Å stronger than C IV 5801-12 Å, C II 4267 Å present, and O V 5572-98 Å weak or absent.

W, from → Wolf-Rayet; C, from → carbon; → star.

weak
  نزار، کمنور، کمزور   
nezâr (#), kamnur (#), kamzur (#)

Fr.: faible   

Not powerful or intense.
electroweak epoch, → electroweak force, → electroweak interaction, → weak anthropic principle, → weak arm spiral galaxy, → weak emission-line central star, → weak encounter, → weak equivalence principle, → weak force, → weak gravitational lensing, → weak interaction, → weak lensing, → weak nuclear force, → weak wind problem, → weak-line T Tauri star, → weak-wind O-type star.

From O.N. veikr "weak," cognate with O.E. wac "weak, pliant, soft," from P.Gmc. *waikwaz "yield," *wikanan "bend" (cf. Du. week "weak, soft, tender," O.H.G. weih "yielding, soft," Ger. weich "soft," from PIE base *weik- "to bend, wind"

Nezâr "weak, feeble, thin, slim; flesh without fat" (bâde-ye nezâr "a wine with minute alcohol," soxan-e nezâr "inconsistent, weak statement"), variant zâr, Mid.Pers. nizâr "weak, feeble," Mid./Mod.Pers. zarmân "old man, deterioration," Av. zairina- "exhausting, slackening," zaurura- "weak through old age, decrepit," cf. Skt. jára- "wearing out, exhaustion," jaranā- "old, decayed," jarimán- "weakness through old age," Gk. geron "old man," L. granum "grain;" PIE base *ger- "wear away."
Kamnur, from kam "little, few; deficient, wanting; scarce" (Mid.Pers. kam "little, small, few," O.Pers./Av. kamna- "small, few") + nur, → light.
Kamzur, from ham + zur, → strength.

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