An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 716

Fr.: décrément   

1) The amount lost in the process of decreasing.
2) Math.: The quantity by which a variable is decreased. A negative → increment.
3) 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 kâhidan, → decrease + noun suffix .


Fr.: décryptage   

Make crypted data or information intelligible. See also → encrypt and → decode.

de- + crypt, → encrypt.

vânehâneš (#)

Fr.: décryptage   

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

decrypt; → -tion.

  فروهاختن، فروهازیدن   
foruhâxtan, foruhâzidan

Fr.: déduire   

To derive as a conclusion from facts or premises.

L. deducere "to lead down, derive," from → de- "down" + ducere "to lead."

Foruhâxtan, foruhâzidan, from foru- "down," → de- + Mid.Pers. hâxtan, hâzidan "to lead, guide, persuade," Av. hak-, hacaiti "to attach oneself to, to join," cf. Skt. sacate "accompanies, follows," Gk. hepesthai "to follow," L. sequi "to follow;" PIE *sekw- "to follow."


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.


Fr.: déductif   

Of or relating to → deduction.

From deduct, → deduce, + → -ive.

deductive reasoning
  راینش ِ فروهازشی   
râyaneš-e foryhâzeši

Fr.: raisonnement déductif   

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

deductive; → reasoning.

  ۱) ژرف، گود؛ ۲) ژرفنا   
1) žarf (#), gowd (#); 2) žarfnâ (#)

Fr.: 1) profond; 2) profondeur   

1a) General: Extending well inward from an outer surface or back from an edge.
1b) Great in measure; intense. → deep exposure.
1c) Of colors, dark and vivid.
2) The deep part of a body of water, especially an area of the ocean floor having a depth greater than 5400 meters (

O.E. deop, from P.Gmc. *deupaz, from PIE *d(e)u- "deep, hollow."

Žarf "deep;" variants Gilaki jalf, julf, jal; Tabari jol, jal, jul; Baluci jahl, johl; Kermâni jarr "deep;" Mid.Pers. zufr; Av. jafra- "deep."
Gowd, probably ultimately from PIE root *gwādh- "to sink, submerge;" cf. Av. vigāθô- "ravines, gorges;" Skt. gādha- "depth; shallow;" Gk. bessa "gorge, ravine."

deep exposure
  نورداد ِ ژرف   

Fr.: pose profonde   

An exposure in which the detector shutter remains open for a relatively long time in order to bring out the weaker features of the observed object. In practice a deep exposure with a CCD detector is usually obtained from co-addition of shorter exposures.

deep; → exposure.

deep field
  میدان ِ ژرف   
meydân-e žarf

Fr.: champ profond   

An area on the sky whose image is obtained with a deep exposure, such as → Hubble Deep Field.

deep; → field.

deep image
  تصویر ِ ژرف   
tasvir-e žarf

Fr.: image profonde   

An image obtained using a deep exposure to reveal the weak features of the object.

deep; → image.

deep time
  زمان ِ ژرف   
zamân-e žarf

Fr.: temps profond   

The time-scale of geologic processes which is millions or billions of years in contrast to the few thousand years claimed by supporters of the → creationism. The concept of "deep time" was first described in 1788 by the Scottish geologist James Hutton (1726-1797) in the Transactions of the Royal Society of Edinburgh. The term was coined by the American author John McPhee (1931-).

deep; → time.


Fr.: défaut   

1) Failure to act; inaction or neglect; failure to meet financial obligations.
2) Lack; want; absence. See also → deficiency, → lack, → shortage.
3) Computers: A selection automatically used by a program when none is specified by the user. → by default.

M.E. defau(l)te, O.Fr. defaute "fault, defect, failure," from V.L. *defallita "a deficiency or failure," p.p. of *defallere, from L. → de- "away" + fallere "to deceive, to cheat; to put wrong, to lead astray."

Nâbun, literally "not-being, non-existence," from nâ- negation prefix, → non-, + (Kurd.) bun "to be," variants (Gazi, Yarani, Gurani, Semnâni) bu-, classical Pers. bov-, budan "to be, → exist."

  آک؛ کاست   
âk; kâst (#)

Fr.: défaut   

General: Something or a lack of something that results in incompleteness, inadequacy, or imperfection.
Crystals: A discontinuity in the arrangement of atoms, ions, or electrons.
Cosmology: → cosmic defect.

From L. defectus "failure," from p.p. of deficere "to fail, desert," from → de- "down, away" + facere "to do," (cf. Fr. faire, Sp. hacer), from PIE base *dhe- "to put, to do" (cf. Av. dadaiti "he puts," Skt. dadhati "puts, places," Hitt. dai- "to place," Gk. tithenai "to put."

Âk "defect, blemish;" Mid.Pers. ak, âk "evil, harm;" Av. aka- "bad, wicked;" cf. Skt. aka- "pain , trouble."
Kâst "loss," from kâstan, kâhidan "to decrease, lessen, diminish," from Mid.Pers. kâhitan, kâstan, kâhênitan "to decrease, diminish, lessen;" keh "small, little, slender;" Av. kasu- "small, little;" Proto-Iranian *kas- "to be small, diminish, lessen."

padâfandidan (#)

Fr.: défendre   

1) To ward off attack from; guard against assault or injury.
2) To maintain by argument, evidence, etc.; uphold (

From → de- "from, away," + -fendere "to strike, push," → offend.

Padâfandidan, from padâfand, from prefix pad- "contrary to; against; opposing," → counter-, + âfand "strife, war," → offend.


Fr.: défenseur   

A person who defends someone or something.

defend; → -er.

padâfand (#)

Fr.: défense   

1) Resistance against attack; protection.
2) The defending of a cause or the like by speech, argument, etc. (

Noun from → defend.

  ۱) پدافندگر؛ ۲) پدافندگری   
1) padâfandgar; 2) padâfandgari

Fr.: défensif   

1) Serving to defend; protective; of or relating to defense.
2) A position or attitude of defense (

defense; → -ive.

  فلک ِ حامل   
falak-e hâmel (#)

Fr.: déférent   

In Ptolemy's geocentric model, the circle around the Earth in which the center of the → epicycle of a body was thought to move.

Deferent, from L. deferent-, pr.p. of deferre "to carry from or down, transfer" from → de- + ferre "to carry, bear," from PIE *bher- "to bear, to carry, to take" (cf. O.Pers./Av. bar- "to bear, carry," barəθre "to bear" (infinitive), Mod.Pers. bordan, bar- "to carry," Skt. bharati "he carries," Gk. pherein "to carry").

Falak-e hâmel, from Ar. falak "heaven; orbit, sphere" + hamil "carrier."

deferred charge
  بار ِ بازداشته   
bâr-e bâzdâšté

Fr.: rétention de charge   

In a CCD detector, phenomenon caused by charge traps or potential pockets, which prevent electrons from being released to the adjacent pixel; eventually the electrons may be released in a subsequent cycle.

Differed, p.p. of differ, from O.Fr. différer, from L. differre "set apart, put off, delay," also "be different, differ," → differ; → charge.

Bârcharge; bâzdâšté "prevented," p.p. of bâzdâštan, from preventive suffix bâz- + dâštan "to hold, have, maintain," Mid.Pers. dâštan, O.Pers./Av. root dar- "to hold, keep back, maitain, keep in mind," Skt. dhar- "to hold, keep, preserve," dharma- "law," Gk. thronos "elevated seat, throne," L. firmus "firm, stable," Lith. daryti "to make," PIE *dher- "to hold, support."

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