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: 1251
circumblack-hole disk
  گرده‌ی ِ پیرا-سیه‌چال   
gerde-ye pirâ-siyah câl

Fr.: disque autour de trou noir   

An → accretion disk formed around a → black hole.

circum-; → black; → hole.

circumcenter
  پیرامرکز   
pirâmarkaz

Fr.: centre du cercle circonscrit d'un triangle   

In a triangle, the point where the perpendicular bisectors of the triangle's sides converge.

circum-; → center.

circumcircle
  پیراپرهون   
pirâparhun

Fr.: cercle circonscrit   

A circle which passes through all three vertices of a triangle Also "Circumscribed circle".

circum-; → circle.

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
  پیراکشیدن   
pirâkašidan

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- + kašidan "to draw," Mid.Pers. kašitan, Av. karš- "to draw," Skt. kars-, kársati "to pull, drag, plough."

circumscribed sphere
  سپهر ِ پیراکشیده، کره‌ی ِ ~، گوی ِ ~   
sepehr-e pirâkašidé, 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.

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