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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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deceleration
  واشتاب   
vâšetâb (#)

Fr.: décéleration   

The act or process of moving, or of causing to move, with decreasing speed. Sometimes called negative acceleration.

Verbal noun of decelerate.

deceleration parameter
  پارامون ِ واشتاب   
pârâmun-e vâšetâb

Fr.: paramètre de décéleration   

A parameter designating the rate at which the expansion of the Universe would slow down owing to the braking gravitational effect of the matter content of the Universe. It is expressed by: q(t) = -R(t)R ..(t)/R .2(t), where R(t) represents the size of the Universe at time t. See also → expansion parameter; compare with → acceleration parameter.

deceleration; → parameter.

decimal fraction
  برخه‌ی ِ دهدهی   
barxe-ye dahdahi

Fr.: fraction décimale   

A fraction expressed by using → decimal representation, as opposed to a vulgar fraction. For example, 2/5 is a vulgar fraction; 0.40 is a decimal fraction.

decimal; → fraction.

decimal representation
  نمایش ِ دهدهی   
nemâyeš-e dahdahi

Fr.: représentation décimale   

A representation of a real number between 0 and 1, as written a = d1d2d3 ..., where each di is one of the digits 0, 1, 2, ..., 9. This means that a = d1 x 10-1 + d2 x 10-2 + d3 x 10-3+ ...

decimal; → representation.

decision
  واسون   
vâsun

Fr.: décision   

The act or process of deciding. → rule of decision.

Verbal noun of → decide.

declaration
  روناگش   
runâgeš

Fr.: déclaration   

The act of declaring; announcement.
2) Something that is announced or proclaimed.

Verbal noun of → declare.

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.

decomposition
  واهمنهش   
vâhamneheš

Fr.: décomposition   

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

From → de- + → composition.

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.

decryption
  وانهانش   
vânehâneš (#)

Fr.: décryptage   

The process of restoring encrypted data back to the original information. See also → encryption and → decoding.

decrypt; → -tion.

deduction
  فروهازش   
foruhâzeš

Fr.: déduction   

1) The act or process of deducting; something that is or may be deduced.
2) A process of reasoning in which a conclusion is derived from the premises presented without a need for additional information. → deductive reasoning.

Verbal noun from → deduce.

deductive reasoning
  راینش ِ فروهازشی   
râyaneš-e foryhâzeši

Fr.: raisonnement déductif   

Reasoning from the → general to the → particular (or from → cause to → effect).

deductive; → reasoning.

definition
  هدارش   
hedâreš

Fr.: définition   

1) The act or process of establishing some value or condition with precision.
2) The formal statement of the meaning or significance of a word, concept, etc.
3) Optics: The clarity, fidelity, sharpness, and brilliancy of an image formed by an optical system.

Verbal noun of → define.

deflagration
  تشکفت   
taškaft

Fr.: déflagration   

A rapid → chemical reaction in which the → output of → heat is enough to enable the reaction to proceed and be accelerated without input of heat from another source. The effect of a true deflagration under confinement is an → explosion. See also: → detonation; → explosion.

Verbal noun of → deflagrate.

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