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: 13116 Search : far
cold dark matter (CDM)
  ماده‌ی ِ سرد ِ تاریک   
mâdde-ye sard-e târik (#)

Fr.: matière noire froide   

Any → hypothetical → non-baryonic  → dark matter that is → non-relativistic at the point of → decoupling in the → early Universe. CDM plays a key role in → cosmic structure formation. See also → CDM model, → lambda cold dark matter, → Meszaros effect, → missing satellites problem.

cold; → dark; → matter.

cold disk accretion
  گرده‌ی ِ فربال ِ سرد   
gerde-ye farbâl-e sard

Fr.: disque d'accrétion froid   

An accretion process whereby material coming from an → accretion disk settles onto the → protostellar surface through a geometrically thin layer or thin accretion columns. Heat brought into the protostar in the accretion flow radiates freely into space until the temperature attains the photospheric value. Most of the stellar surface is unaffected by the accretion flow (see, e.g., Hosokawa et al. 2010, ApJ 721, 478).

cold; → disk; → accretion.

collaboration
  همکاری   
hamkâri (#)

Fr.: collaboration   

The act or process of working with another or others on a joint project.

From Fr. collaboration, noun of action from L. collaborare from → com- "with" + labore "to work."

Hamkâri, from ham-, → com-, + kâr, → work, + -i verbal noun suffix.

collapsar
  رمب‌اختر   
rombaxtar

Fr.: collapsar   

The collapse of the core of a very massive star which results in a black hole accompanied by a very energetic → gamma-ray burst.

From collaps(e) + (st)ar.

collapse
  ۱) رمبیدن؛ ۲) رمبش   
1) rombidan (#); 2) rombeš (#)

Fr.: 1) s'effondrer; 2) effondrement   

1) (v.) To fall inward abruptly under its own → gravity.
2) (n.) The act of falling inward abruptly under its own gravity. → gravitational collapse; → core collapse.

From L. collapsus, p.p. of collabi "fall together," from → com- "together" + labi "to fall, slip."

1) Mod.Pers. rombidan "to fall apart, to crumble," Hamadâni, Malâyeri: rommidan, Lori remese "get destroyed," remane "to destroy a building," possibly cognate with E. crumble "to break into small fragments," from O.E. cruma, akin to D. kruim, Ger. Krume "crumb," L. grumus "heap of earth," root of Fr. grumeau "lump."
2) Rombeš from present stem romb "collapse" + noun suffix -eš.

collapse of the wave function
  رمبش ِ کریای ِ موج   
rombeš-e karyâ-ye mowj

Fr.: effondrement de la fonction d'onde   

The idea, central to the → Copenhagen Interpretation of quantum theory, whereby at the moment of observation the → wave function changes irreversibly from a description of all of the possibilities that could be observed to a description of only the event that is observed. More specifically, quantum entities such as electrons exist as waves until they are observed, then "collapse" into point-like particles. According to the Copenhagen Interpretation, observation causes the wave function to collapse. However it is not known what causes the wave function to collapse. Same as → wave collapse.

collapse; → wave function.

collapsed star
  ستاره‌ی ِ رمبیده   
setâre-ye rombidé

Fr.: étoile effondrée   

A star that has undergone → collapse.

Collapsed p.p. of → collapse; → star.

Setâré, → star; rombidé p.p. of rombidan, → collapse.

collect
  ۱) گرد‌آوردن، انباشتن؛ ۲) گرد‌آمدن   
1) gerdâvardan (#), anbâštan (#); 2) gerdâmadan

Fr.: 1) collecter, réunir, accumuler, ramasser; 2) s'accumuler, se réunir   

1a) To bring together into a one body or place.
1b) To gather and gradually accumulate in a place.
2) to gather together; assemble.

From O.Fr. collecter, from L. collectus, p.p. of colligere "gather together," from → com- "together" + legere "to gather," cf. L. lignum "wood, firewood," lit. "that which is gathered"; cognate with Gk. legein "to say, tell, declare," from PIE *leg- "to pick together, gather, collect"

1) Gerdâvardan "to collect," from gerd "round; around," → disk; alternatively, ultimately from PIE base *ger- "to gather," cf. Iranian ger-, gor-, etc. "to gather," → category, + âvardan "to bring," → production.
Anbâštan, anbârdan "to fill, to replete;" Mid.Pers. hambāridan "to fill;" from Proto-Iranian *ham-par-, from prefix ham-, → com-, + par- "to fill;" cf. Av. par- "to fill," parav-, pauru-, pouru- "full, much, many;" O.Pers. paru- "much, many;" Mid.Pers. purr "full;" Mod.Pers. por "full, much, very;" PIE base *pelu- "full," from *pel- "to be full;" cf. Skt. puru- "much, abundant;" Gk. polus "many," plethos "great number, multitude;" O.E. full.
2) Gerdâmadan "to come together," with âmadan "to come," → efficiency.

collect and collapse model
  مدل ِ انباشت و رمبش   
model-e anbâšt va rombeš

Fr.: modèle d'accumulation et d'effondrement   

A → sequential star formation model involving → massive stars and → H II regions. The energetic ultraviolet photons from a massive star born in a → molecular cloud drive a spherical → ionization front radially outward from the star at a velocity much higher than the → sound speed in the cold neutral gas. The supersonic expansion of the H II region through the surrounding neutral gas creates a → shock front, sweeping up an increasingly massive and dense shell of cool neutral gas. This is the collect phase of the process in which the H II region simply acts like a snowplough. If the expansion of the H II region continues for long enough, the surface density of the shell increases to the point where the shell becomes self-gravitating. The shell is then expected to collapse and fragment. Individual fragments may then enter a non-linear collapse phase, possibly forming massive stars. This model was first proposed by Elmegreen & Lada (1977, ApJ 214, 725), who used a one-dimensional analysis. Whitworth et al. (1994, MNRAS, 268, 291) developed an analytical model for the collect and collapse process which predicts the fragmentation time, the size, number, and mass of the fragments (see also Elmegreen 1998, in ASP Conf. Ser. 148, Origins, eds. Woodward et al., p. 150 and references therein). → stimulated star formation, → triggered star formation.

collect; → collapse; → model.

collecting area
  پهنه‌ی ِ گرد‌آور   
pahne-ye gerdâvar

Fr.: surface collectrice   

Of an interferometric telescope made up of several mirrors, the hypothetical mirror created by the combination of the individual mirrors.

collect; → area.

collection
  گرد‌آورش، گرد‌آورد، گرد‌آمد، گرد‌آیند   
gerdâvareš, gerdâvard, gerdâmad, gerdâyand (#)

Fr.: collection   

1) The act or process of collecting.
2) A group of objects or works to be seen, studied, or kept together.

Verbal noun from → collect.

collective
  گرد‌آمدی   
gerdâmadi

Fr.: collectif   

Forming a whole; of or characteristic of a group taken together.

collect + → -ive.

collective behavior
  رفتار ِ گرد‌آمدی   
raftâr-e gerdâmadi

Fr.: comportement collectif   

1) The whole behavior of a system of many interacting components, which differs from that of the individual components. Some classical examples are the → many-body problem, → phase transition, most of thermodynamic phenomena, collective oscillations occurring in solids, etc. Physics dealt with collective behavior much earlier than the term collective behavior was even coined.
2) Sociology: The more or less unpredictable act of people when being in group, which is totally different from the behavior they would have if acted individually.
3) Biology: A large number of group phenomena such as pattern formation, self organization, trail formation, and synchronization seen among many living creatures.

collective; → behavior.

collective star formation
  دیسش ِ گرد‌آمدی ِ ستارگان   
diseš-e gerdâmdi-ye setâregân

Fr.: formation collective d'étolies   

Formation of stars, especially → massive stars, in group as opposed to individual formation.

collective; → star; → formation.

collectivism
  گرد‌آمدگرایی   
gerdâmadgerâyi

Fr.: collectivisme   

1) The principle of ownership of the means of production, by the state or the people.
2) A social system based on this principle (Dictionary.com).

collective; → -ism.

collectivity
  گرد‌آمدیگی   
gerdâmadigi

Fr.: collectivité   

1) Collective character.
2) A collective whole.

collective; → -ity.

collectivization
  گرد‌آمدش، گرد‌آمدکرد   
gerâmadideš, gerâdmad-kard

Fr.: collectivisation   

The process of forming collectives or collective communities where property and resources are owned by the community and not individuals (TheFreeDictionary.com).

Verbal noun of → collectivize.

collectivize
  گرد‌آمدیدن، گرد‌آمدکردن   
gerâmadidan, gerâdmad kardan

Fr.: collectiviser   

To organize (a people, industry, economy, etc.) according to the principles of → collectivism (Dictionary.com).

collective; → -ize.

collector
  گرد‌آور   
gerdâvar (#)

Fr.: collecteur   

A device that collects: a solar energy collector; a dust collector.
The semiconductor region in a bipolar junction transistor in which most of the current flows.

From → collect + -or.

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."

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 coo Cor Cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc 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 dod Dop dou Dra dua dus dwa dyn DZ 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 ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag 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 mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>