An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13046 Search : far
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   

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 .

decrypt
  وانهاندن   
vânahândan

Fr.: décryptage   

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

de- + crypt, → encrypt.

decryption
  وانهانش   
vânehâneš (#)

Fr.: décryptage   

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

decrypt; → -tion.

deduce
  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."

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
  فروهازشی   
foruhâzeši

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.

deep
  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 (Dictionary.com).

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."

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara arc Ari arr Asi ass ast ast asy atm ato att aut ave axi Bab bal ban bar bar bea Bel Bes bia Big bin bin bip Bla bla bli blu Boh Bon bos Bou bra bri bro bur cal cal can Cap car Car cat Cau cea Cen cen cha Cha cha che chi chr cir cir civ cla clo clo CMB 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 cop Cor CoR cor cos cos Cou cou CP- cre cri cro cub cur cya Cyg dan dar dau de- deb dec dec dee def deg del den den dep des deu dew dia dif dif dih dip dir dis dis dis dis dis diu doc dop dou DQ dry dus dwa dyn Dys Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext eye fac fal Far fed Fer fer fie fin fir fit fla flo flu fol for for Fou fra fre Fre fro fuz gai Gal Gal gam gas Gau gen gen geo geo geo gia glo gol gra gra gra gra gre gri gui H I hai Ham har Hau hea hec hel hel her HES hie hig his hom hor hot Hub Hul Huy hyd hyd hyl hyp ice ide ima imm imp imp inc ind ind ine inf inf inf inh inn ins ins int int int int int int int int inv ion ion Irr iso iso iso Jal JHK Jul jur Kel Kep kin kne L d Lag lam Lap lar lat law Lea len lep lib lig lin lin lin liq lit loc log lon Los low lum lun Lut Lyr mac mag mag mag mag mag maj man Mar mas mas mat Max mea mec mel Mer Mes met met met mic mid Mil min mir mix mod mod mol mon mor mov mul muo mys nan nat Nav nec nep neu new New NGC Noa nom non non nor not nuc nuc num nyc obj obs obs oce odd OH Omi Oor ope opt opt opt orb ord Ori ort osc out ove oxi pai pan par Par Par par pas pea Pen per per per per Per per pha phl pho pho pho phy Pip Pla pla PLA pla ple plu pol pol pol pol pop pos pos pot Pra pre pre pre pre pri pri pro pro pro pro pro pro pro pse pul pur qua qua qua qua qui rad rad rad rad rad rad raf ran rar ray rea rea rec rec red red ref ref reg rel rel rel rep res res res res ret rev ric rig rin roc ROS rot Rox rus Sad sal sat sca sca Sch sci scy sec sec see sel sem sen Ser sex Sha she sho sid sig sil sim sin siz sle SMA SNR Sof sol sol sol sol sou Sou spa Sp spe spe spe sph spi Spi spr sta sta sta sta sta ste ste ste sto str str Sty sub sub suc sun sup sup sup sup sur Swa syn syn tac tas tel tem ter tes the the the the Tho thr tid tim Tit top tot tra tra TRA tra tre tri tri tru tum tur TY Typ ult una und uni uni uno upp urg UX Van var veg vel ver vib vio vir vis Voi vow wan wat wav WC wea wel whi Wil wir WNh wor X-r yel ytt zer zon > >>