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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1234
collide
  همکوبیدن   
hamkubidan

Fr.: se heurter, heurter, entrer en collision   

1) To strike together with forceful impact, such as two astronomical objects.
2) Of two or more atomic particles, to approach closely resulting in an abrupt change of momentum or exchange of energy.

From L. collidere "to strike together," from col- variant of → com- "together" + laedere "to strike," of unknown origin.

Ham- "together, with," → com- + kubidan, kuftan "to beat, strike, pound," kus "drum," Mid.Pers. kôftan and kôstan "to beat, strike."

collider
  همکوبگر، همکوبنده   
hamkubgar, hamkubandé

Fr.: collisionneur   

A particle accelerator in which two beams of particles are forced to collide head on.

Agent noun from → collide + → -or.

colliding-beam accelerator
  شتابگر با تابه‌ی ِ همکوبنده   
šetâbgar bâ tâbe-ye hamkubandé

Fr.: accélérateur à faisceau de collision   

Same as → collider.

collide; → beam; → accelerator.

collimate
  همراستاییدن، همراستا کردن   
hamrâstâyidan, hamrâstâ kardan

Fr.: collimater   

To pack and align photons or atomic particles parallel to a particular direction.

L. collimatus, p.p. of collimare, alteration of collineare "to make straight," from → com- + linealine.

From ham- "together, with," → com- + râstâ, → direction, + -idan infinitive suffix, kardan "to do," → work.

collimated beam
  تابه‌ی ِ همراستا   
tâbe-ye hamrâstâ

Fr.: faisceau collimaté   

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

collimate; → beam.

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.

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 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).

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