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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<< < -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 > >>

Number of Results: 13116 Search : far
circumference
  پیرامون   
pirâmun (#)

Fr.: circonférence   

1) The boundary line of a circle.
2) The boundary line of a figure, area, or object.

From M.E., from O.Fr. circonference, from L. circumferentia, from circumferens, circumferent-, pr.p. of circumferre "to carry around," from → circum- + ferre "to carry," from PIE root *bher-; "to carry;" cf. Av./O.Pers. bar- "to bear, carry," barəθre "to bear (infinitive)," barəθri- "a female that bears (children), a mother," Mod.Pers. bordan "to carry," Skt. bharati "he carries," Gk. pherein, P.Gmc. *beranan (O.H.G. beran, Goth. bairan "to carry").

Pirâmun, from Mid.Pers. pêrâmôn, from O.Pers./Av. mâ-, mây- "to measure," from PIE *me- "measure," cf. Skt. mati "measures," matra "measure," Gk. metra "lot, portion," L. metri "to measure." In Mod.Pers. this stem is extant in peymaân, peymaâné, âzmun, âzmâyeš.

circumfix
  پیراوند   
pirâvand

Fr.: circumfixe   

An → affix made up of two separate parts which surround and attach to a base.

circum-; → affix.

circumgalactic medium (CGM)
  مدیم ِ پیراکهکشانی   
madim-e pirâkahkešâni

Fr.: milieu circumgalactique   

The interface between a galaxy and the → intergalactic medium. The circumgalactic medium comprises gas located in the → halo of a galaxy extending out to the → virial radius.

circum-; → galactic.

circumlunar
  پیرامانگی، پیراماهی   
pirâmângi, pirâmâhi (#)

Fr.: circumlunaire   

Surrounding or revolving around the Moon.

Circumlunar, from → circum- + → lunar.

circumnuclear
  پیراهسته‌ای   
pirâhasteyi

Fr.: circumnucléaire   

Situated around a → nucleus, as of a → circumnuclear disk.

circum- + → nuclear.

circumnuclear disk
  گرده‌ی ِ پیراهسته‌ای   
gerde-ye pirâhasteyi

Fr.: disque circumnucléaire   

A thick disk of gas and dust clouds surrounding the → Galactic Center up to about 20 → light-years. The disk is very clumpy; the → clumps have densities of several 105 particles/cm3, radii of about 0.3 light-years, and gas temperatures above 100 K. The hydrogen mass of the disk is a few 104 → solar masses. Such circumnuclear disks are present also in other galaxies.

circumnuclear; → disk.

circumpolar
  پیراقطبی   
pirâqotbi (#)

Fr.: circumpolaire   

Situated around or near a pole, as of the Earth or the sky. → circumpolar star.

circum-; → polar.

circumpolar star
  ستاره‌ی ِ پیراقطبی   
setâre-ye pirâqotbi (#)

Fr.: étoile circumpolaire   

Star that, from a given observer's → latitude, does not rise or set, but circles around the → celestial pole. To be circumpolar, a star must have a polar distance that is less than the observer's latitude. Whether a given star is circumpolar at the observer's latitude (φ) may be calculated in terms of the star's → declination (δ). The star is circumpolar if φ + δ ≥ +90° (observer in northern hemisphere), or φ + δ ≤ -90° (observer in southern hemisphere).

circumpolar; → star.

circumscribe
  پیراوشتن   
pirâveštan

Fr.: circonscrire   

To draw a line around; encircle.

L. circumscribere "to draw a line around, confine," from → circum- + scribere "write," from PIE *skreibh-, from *sker- "to cut, incise."

Pirâkašidan, from pirâ-, → circum- + vešidan "to write," → inscribe.

circumscribed sphere
  سپهر ِ پیراوشته، کره‌ی ِ ~، گوی ِ ~   
sepehr-e pirâvešte, kore-ye ~, guy-e ~

Fr.: sphère circonscrite   

A sphere containing a polyhedron (such as a pyramid) all of whose vertices lie on the surface of the sphere. The polyhedron so contained is said to be inscribed in the sphere.

Circumscribed p.p. of → circumscribe; → sphere.

circumsolar
  پیراخورشیدی   
pirâxoršidi

Fr.: circumsolaire   

Surrounding or revolving around the Sun, such as circumsolar space, circumsolar dust.

Circumsolar, from → circum- + → solar.

circumspect
  پیراگاس   
pirâgâs

Fr.: circonspect   

Watchful and discreet; cautious; prudent:

circum-; → suspect.

circumspection
  پیراگاسش   
pirâgâseš

Fr.: circonspection   

Circumspect observation or action; caution; prudence.

circumspect.

circumstance
  پیراستاد   
pirâstâd

Fr.: circonstance   

A condition or fact attending an event and having some bearing on it.

L. circumstantia "surrounding condition," neut. pl. of circumstans, pr.p. of circumstare "to stand around," from → circum- + stare "to stand" from PIE *sta- "to stand."

Pirâstâd, from pirâ-, → circum-, + âstâd, istâd "standing," from istâdan "to stand," Mid.Pers. êstâtan, O.Pers./Av. sta- "to stand, stand still; set," Av. hištaiti, cf. Skt. sthâ- "to stand," âsthâ- "condition, circumstance," Gk. histemi "put, place, weigh," stasis "a standing still," L. stare "to stand."

circumstellar
  پیراستاره‌ای   
pirâsetâreyi

Fr.: circumstellaire   

Surrounding or occurring around a star.

Circumstellar, from → circum- + → stellar.

circumstellar disk
  گرده‌ی ِ پیراستاره‌ای   
gerde-ye pirâsetâreyi

Fr.: disque circumstellaire   

Any concentration of material in the form of a disk orbiting around a star. → accretion disk; → protoplanetary disk.

circumstellar; → disk.

circumstellar dust
  غبار ِ پیراستاره‌ای   
qobâr-e pirâsetâreyi

Fr.: poussière circumstellaire   

Interstellar → dust grains localized around various types of stars, such as → asymptotic giant branch stars. Circumstellar dust occurs in the form of a spherical shell or a disk and is at the origin of an → infrared excess for the central star. See also → circumstellar matter.

circumstellar; → dust.

circumstellar envelope
  پوشه‌ی ِ پیراستاره‌ای   
puše-ye pirâsetâre-yi

Fr.: enveloppe circumstellaire   

A very extensive envelope of cold gaseous materials surrounding evolved cool stars, notably → red giants, → red supergiants (→ Mira variables), or → asymptotic giant branch stars. The typical size of such envelopes is several thousands times that of the stellar radius and their temperature ranges from 1000 to10 K. Circumstellar envelopes result from mass loss from the central star (10-7 to 10-4solar masses per year) and expand with moderate velocities (10 to 15 km sec-1). The low temperature of the envelope is at the origin of the formation of molecules, which in certain conditions provide → maser emission (H2O, OH, SiO). Similarly, dust grains form in the envelope produce an → infrared excess emission.

circumstellar; → envelope.

circumstellar environment
  پرگیر ِ پیراستاره‌ای   
pargir-e pirâsetâre-yi

Fr.: environnement circumstellaire   

The circumstances or physical conditions related to the immediate surroundings of a star.

circumstellar; → environment.

circumstellar habitable zone
  زنار ِ زیست پذیر ِ پیراستاره‌ای   
zonâr-e zistpazir-e pirâsetâreyi

Fr.: zone habitable circumstellaire   

A zone around a star within which a planet can have temperatures that permit liquid water, depending on the luminosity of the star and the distance of the planet from it.

circumstellar; → habitable zone.

<< < -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 > >>