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: 692
declension
  واکیله   
vâkilé

Fr.: déclinaison   

The → inflection of nouns, pronouns, or adjectives for case, number, and gender.

M.E. declenson, declynson (with suffix later assimilated to -sion), from O.Fr. declinaison, from L. declinatio, → declination

declination.

declination
  واکیلش   
vâkileš

Fr.: déclinaison   

1) Angular distance (symbol δ) from the celestial equator. One of the coordinates, with → right ascension, that defines the position of a heavenly body in the equator system. Declination is measured positively (+) north or negatively (-) south of the celestial equator from 0° to 90°.
2) Angle between geographic North and magnetic North (symbol D).

Verbal noun of → decline; → -tion.

declination axis
  آسه‌ی ِ واکیلش   
âse-ye vâkileš

Fr.: axe de déclinaison   

The axis to which the telescope tube is fastened in an → equatorial mounting.

declination; → axis.

declination circle
  پرهون ِ واکیلش، دایره‌ی ِ ~   
parhun-e vâkileš, dâyeré-ye ~

Fr.: cercle de déclinaison   

For a telescope with an → equatorial mounting, a graduated circle attached to the → declination axis that shows the → declination to which the telescope is pointing.

declination; → circle.

decline
  ۱) واکیلیدن؛ ۲) واکیل   
1) vâkilidan; 2) vâkil

Fr.: décliner, se décliner   

1a) To bend down; slope downward; descend.
1b) Grammar: To → inflect according to the various cases of a noun, adjective, or pronoun.
2) The process of declining; a downward movement; gradual loss or deterioration.

M.E. declinen, from O.Fr. decliner "to sink, decline, degenerate, turn aside," from declinare "to turn away, inflect," from → de- + clinare "to bend," cf. Gk. klinein "to cause to slope, slant, incline," Skt. sri- "to lean," O.Pers. θray-, Av. sray- "to lean," Mod.Pers. kil "bent, inclined, slant," PIE base *klei- "to lean, incline" from which is also derived (Ger. lehnen, E. lean).

Vâkil, from prefix vâ- "away" + kil "bent, crooked, inclined" [Dehxodâ], Mid.Pers. xwahl "bent, crooked" (Mod.Pers. dialectal/colloquial variants kowleh, cowleh, cowl, caval, xohl, xohal, hol), cf. Skt. kûla- "slope, declivity;" PIE base *klei-, as above. → inclination

decode
  وارمزاندن، رمز‌برداشتن   
vâramzândan, ramz bardâštan

Fr.: décoder   

To convert encoded symbols so that they can be used by the computer or understood by a person. See also → encode and → decrypt.

de-; → code.

Vâramzidan, from vâ-, → de-. Ramz bardâštan, from ramz, → code, + bardâštan "to remove, to take," from bar- "on; up; upon; in; into; at; forth; with," → on-, + dâštan "to have; to hold; to posses," → property.

decoder
  وارمزانشگر   
vâramzânešgar

Fr.: décodeur   

An electronic device that converts audio or video signals into a different form that can be heard or seen correctly.

decode; → -er.

decoding
  وارمزانش، رمزبرداری   
vâramzâneš, ramz bardâri

Fr.: décodage   

The process of translating data or a message from a code into the original language or form. See also → encoding and → decryption.

decode; → -ing.

decompose
  واهمنهادن   
vâhamnehâdan

Fr.: décomposer   

Of a physical force or entity or chemical substance, to separate or break into constituent parts or elements.

From → de- + → compose.

decomposition
  واهمنهش   
vâhamneheš

Fr.: décomposition   

The process or the state of breaking down a physical entity or an organic material.

From → de- + → composition.

decompress
  واتنجیدن   
vâtanjidan

Fr.: décomprimer   

To cause to undergo → decompression.

de- + → compress.

decompression
  واتنجش   
vâtanješ

Fr.: décompression   

1) A gradual decrease in surrounding → pressure, especially the controlled decrease in pressure that divers undergo after working in deep water or breathing compressed air.
2) Computers: The restoration of compressed electronic data to their full size.

de- + → compression.

deconvolution
  واهماگیش   
vâhamâgiš

Fr.: déconvolution   

A mathematical operation that allows to restore the original input signal, such as an astronomical image or spectrum, to its state before being affected by the → atmospheric turbulence and the → transfer function of the instrument. → convolution.

From → de- + → convolution.

deconvolution algorithm
  خوارزمیک ِ واهماگیش   
xârazmik-e vâhamâgiš

Fr.: logiciel de déconvolution, algorithme ~ ~   

An algorithm used to improve the resolution of an image particularly when the convolving function is well defined. Also called deconvolution code.

deconvolution; → algorithm.

deconvolve
  واهماگیشیدن   
vâhamâgišidan

Fr.: déconvoluer   

Verbal form of → deconvolution.

From → de- + → convolve.

decouple
  واجفسریدن، واجفتیدن   
vâjafsaridan, vâjoftidan

Fr.: découpler   

1) To separate or detach; to cause to become disconnected or divergent.
2) Electronics: To reduce or eliminate the coupling of (one circuit or part to another).
3) Physics: To decrease or eliminate the shock waves of a nuclear explosion by having it take place underground.

de- + → couple.

decoupling
  واجفسری، واجفتش   
vâjafsari, vâjofteš

Fr.: découplage   

Cosmology: In the early history of the Universe, separation of matter and radiation due to their non-interaction. At a redshift of 1000, that is about 400,000 years after the Big Bang, the temperature would have cooled to the point (4000 degrees Kelvin) where electrons and nuclei can recombine and form neutral hydrogen atoms. Since atoms do not scatter the radiation appreciably, free electrons were lacking, and the Universe became transparent to radiation. Same as → recombination. See also → decoupling era.

Verbal noun of decouple, from → de- + → couple + → -ing.

decoupling era
  دوران ِ واجفسری، ~ واجفتش   
dowrân-e vâjafsari, ~ vâjofteš

Fr.: époque du découplage   

The era some 400,000 years after the → Big Bang, when the cosmic → blackbody radiation was last scattered by the matter. → decoupling. Same as → recombination era and → last scattering epoch.

decoupling; → era.

decrease
  ۱) کاستن، کاهیدن؛ ۲) کاهش   
1) kâstan (#), kâhidan (#); 2) kâheš (#)

Fr.: 1) décroitre; 2) décroissance   

1) (v.tr.) To cause to diminish, to make less. (v.intr.) To diminish or lessen in extent, quantity, power, etc.
2) The act or process of decreasing; condition of being decreased. → Forbush decrease.

Decrease, from M.E. decres (n.), decresen, from O.Fr. descreistre, from L. decrescere, from → de- + crescere "to grow," → crescent.

Kâstan, kâh-, from Mid.Pers. kâhitan, kâstan, kâhênitan "to decrease, diminish, lessen," Av. kasu- "small, little" (Mod.Pers. keh), Proto-Iranian *kas- "to be small, diminish, lessen;" kâheš verbal noun from kâhidan.

decrement
  کاهه   
kâhé

Fr.: décrément   

The amount lost in the process of decreasing.
Math.: The quantity by which a variable is decreased. A negative → increment.
Physics: 1) The ratio of the amplitude of an oscillation to that of its succeeding oscillation in an underdamped vibrating system. 2) The intensity ratio of a series of spectral lines of the same nature, such as → Balmer decrement.

L decrementum, from decre(tus), → decrease + -mentum noun suffix -ment.

Kâheh, from kâh- present stem of kâhidandecrease + noun suffix .

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