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: 12960 Search : far
collimated beam
  تابه‌ی ِ همراستا   
tâbe-ye hamrâstâ

Fr.: faisceau collimaté   

A → beam of → photons or → subatomic particles with a narrow → cross section that has little or no spatial spread.

collimated; → beam.

collimated jet
  شان ِ همراستا   
šân-e hamrâstâ

Fr.: jet collimaté   

A beam of particles in which every particle would have exactly the same direction of travel, thereby the jet moves without → dispersion. Collimated jets of → plasma are associated with → protostars.

collimated; → jet.

collimation
  همراستایش   
hamrâstâyeš

Fr.: collimation   

1) The process of restricting a beam of photons or particles to a given area.
2) The process of adjusting a telescope to place all optical elements in precise alignment. → align a telescope.

Verbal noun of → collimate.

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 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.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che cho cir cir cir cla clo clo clu co- cod 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 Cra Cre cri cro cub cur cya cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dog Dop dou dra dua dus dwa dyn E-E Ear ech eco edu eig Ein ela ele ele ele ele elo emi emp ene eni ent epi equ equ erg est Euc eva evo exa exc exe exo exp exp ext ext F r fac fam fas fee Fer Fib fig fin fir fix fle flu foc For for for fov fre fre Fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo gig glo gov gra gra gra gra gre gro Gum Hab hal han har Hay hea hel hel hem Her het hig Hil hol hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp inc inc ind ind inf inf inf inf inj ins ins int int int int int int int int inv Io ion iro isl iso iso Jal JHK Jul jur Kel Kep kin kne L2 Lag lam Lap lar lat law Lec len Lep lib lig lin lin lin liq lit loc log lon los low lum lun lux Lyr mac mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil min mir mix mod mol mom Moo mos Mu mul mus nad nas nat neb neg net neu New New nig Noe non non non Nor nuc nuc nul nut obe obl obs occ oct off Olb one ope opp opt opt orb orb org Ori ort oth out Owl P-s pal par par par par Pas pat pej peo per per per per per pha Phe pho pho pho phy pin pla pla pla pla pla plu poi pol pol Pol pol pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro pro pro pse pul Pup Qua qua qua qua que rac rad rad rad rad rad rad ran rap 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 rur Sac sal sat sca sca Sch sci Scu sec sec Sed sel sem sen Ser Sey Sha she sho sid sig sim sin sip ske sli smo soc sol sol sol sol sol sou spa spa spe spe spe spe sph spi spo Squ sta sta sta sta ste ste ste sto str str str sub sub sub sum sup sup sup sup sur sus sym syn T d tap tec tem ten tes the the the the thi thr tid tim tip ton tor tow tra tra tra tra tri tri tru tub tur two Typ ult un- und uni uni unp upp urg V20 Van var veg vel ver vib vio vir vis vol vul war wat wav WC5 wea Wer whi WIM wis WO wor X-r yie Zan Zet > >>