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: 13048 Search : far
collimator
  همراستاگر   
hamrâstâgar

Fr.: collimateur   

An instrument that creates a tight parallel beam of light or particles.

Agent noun from → collimate.

Collinder catalog
  کاتالوگ ِ کولیندر   
kâtâlog-e Collinder

Fr.: catalogue de Collinder   

A catalog of → open clusters published in 1931.

Named after Per Collinder (1890-1975) the Swedish astronomer who created the catalog; → catalog.

collinear
  هم-خط   
ham-xatt

Fr.: colinéaire   

Lying on the same straight line. Collinear points are a set of points on the same line.

com- + → linear.

collinear forces
  نیروهای ِ هم-خط   
niruhâ-ye ham-xatt

Fr.: forces collinéaires   

A system of two or more forces that lie along the same → line of action.

collinear; → force.

collinearity
  هم-خطی   
ham-xatti

Fr.: collinéarité   

A mathematical property where all points lying on a line initially still lie on a line after transformation.

collinear; → -ity.

collision
  همکوبش   
hamkubeš

Fr.: collision   

The act or process of colliding, → collide.

Verbal noun from → collide .

collisional
  همکوبشی   
hamkubeši

Fr.: collisionnel   

Of or relating to → collision.

collision; → -al.

collisional cross section
  سکنج ِ اسکرمند ِ همکوبشی   
sekanj-e oskarmand-e hamkubeši

Fr.: section efficace de collision   

Same as → cross section.

collisional; → cross; → section.

collisional decay
  تباهی ِ همکوبشی   
tabâhi-ye hamkuneši

Fr.: désexcitation collisionnelle   

The process when the energy difference between the excited and non excited states of an atom is taken away by an electron during a collision.

collisional; → decay.

collisional excitation
  بر‌انگیزش ِ همکوبشی   
barangizeš-e hamkubeši

Fr.: excitation collisionnelle   

A physical process which is caused by the free electrons that are energized either by → photoionization or → collisional ionization. Collisional excitation puts ions, atoms, and molecules into excited states from which they may decay radiatively. Collisional excitation is important in the → interstellar medium.

collisional; → excitation.

collisional heating
  گرمش ِ همکوبشی   
garmeš-e hamkubeši

Fr.: chauffage par collisions   

A physical process whereby heat is imparted to (e.g. → interstellar dust grains or → molecular hydrogen) through collisions (with hot electrons, ions, etc.).

collisional; → heating.

collisional ionization
  یونش ِ همکوبشی   
yoneš-e hamkubeši

Fr.: ionisation collisionnelle   

An → ionization resulting from a → collision.

collisional; → ionization.

collisional plasma
  پلاسمای ِ همکوبشی   
pelâsmâ-ye hamkubeši

Fr.: plasma collisionnel   

A plasma in which the → mean free path of the → charged particles between two → collisions is much smaller than the size of the system containing the plasma.

collisional; → plasma.

collisionless damping
  میرایی ِ بی‌همکوبش   
mirâyi-ye bihamkubeš

Fr.: amortissement sans collision   

Same as the → Landau damping.

collision; → -less; → damping.

colloquium
  هچایه   
hacâyé

Fr.: colloque   

1) An informal meeting for the exchange of views.
2) A usually academic seminar on a broad field of study, usually led by a different lecturer at each meeting.

From L. colloquium "conference, conversation," from → com- "together" + loqui "to speak".

From Lori hacâyé "conversation among two or more people," maybe from Av. ušyāi- "to speak, talk," from vak- "to speak," Skt. vacas "speech, word," cognate with L. vox "voice," vocare "to call," Gk. ops "voice," epos "song;" PIE root *wek- "to speak".

color
  رنگ   
rang (#)

Fr.: couleur   

1) A visual sensation produced in the brain when the eye views various wavelengths or frequencies of light.
2) Short for → color index.
3) A property of → quarks required to distinguish the three basic quarks of which → baryons are composed. In all → hadrons, the quarks (red, green, blue) are combined in such a way as to yield a colorless overall particle.

From M.E. colour, from O.Fr. colur, from L. color "color, hue," from Old L. colos "a covering," from PIE *kel-os- "that which covers," from *kel- "to cover, conceal."

Rang, from Mid.Pers. rang "color" (abrang "splendor"), related to Mod.Pers. razidan "to color," raxš "a mixture of red and white," also the name of Rostam's horse (loan from Sogd.?), awrang "glory, beauty, throne;" Kurd. raš "black;" cf. Skt. raj- "to color, to become red;" Gk. rezein "to color;" PIE base *(s)reg- "to color, paint" (Cheung 2007).

color charge
  بار ِ رنگ   
bâr-e rang

Fr.: charge de couleur   

In the → standard model of particle physics, a property possessed by → quarks and → gluons that determine rules for how these particles may interact in the context of → quantum chromodynamics. Color charge is analogous to electromagnetic charge, but it comes in three types rather than two, which results in a different type of force, the → strong interaction. There are three pairs of colors and anti-colors, named red (anti-red), green (anti-green), and blue (anti-blue). The terminology has nothing to do with visible color. It is only a word that is used to designate three independent types of the strong charge characteristic.

color; → charge.

color excess
  فزونی ِ رنگ   
fozuni-ye rang,

Fr.: excès de couleur   

The difference between the observed → color index of a star and the intrinsic color index corresponding to its → spectral type. It indicates the modification brought to a color index by the → interstellar absorption.

color; excess, M.E., from O.Fr., from L. excessus "departure, going beyond," p.p. excedere "to depart, go beyond," from → ex- "out" + cedere "to go, yield."

Fozuni, from afzuni "excess," afzuni kardan "to exceed bounds," → add; → color.

color index
  دیشن ِ رنگ   
dišan-e rang

Fr.: indice de couleur   

The difference between the → apparent magnitude of a star measured at one standard wavelength and the apparent magnitude at another longer, standard wavelength, allowing the quantitative measure of a star's color.

color; → index.

color temperature
  دمای ِ رنگ   
damâ-ye rang

Fr.: température de couleur   

The temperature of that black-body which has the same spectral energy distribution in a limited spectral region, as the object under study has.

color; → temperature.

<< < -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 ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit cla clo clo clu 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 con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima Ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp 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 phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad ran rar ray rea rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>