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: 12955 Search : far
compact planetary nebula B[e] star (cPNB[e])
  ستاره‌یِ B[e]ی ِ میغ ِ سیاره‌ای ِ همپک   
setâre-ye B[e]-ye miq-e sayyâre-yi-ye hampak

Fr.: étoile de nébuleuse planétaire compacte   

A star whose spectrum shows striking similarities to → B[e] stars and is evolving into a → planetary nebula (→ preplanetary nebula).

compact; → planetary; → nebula; → B[e] star.

compact radio source
  خن ِ رادیویی ِ همپک   
xan-e râdioyi-ye hampak

Fr.: source radio compacte   

An object emitting intense energy in radio wavelength from a small, unresolved central region.

compact; → radio source.

compact space
  فضای ِ همپک   
fazâ-ye hampak

Fr.: espace compact   

A topological space for which every collection of open sets that covers the space has a finite subset that also covers the space.

compact; → space.

compactification
  همپکانش   
hampakâneš

Fr.: compactification   

1) Math.: A process applied to topological spaces having many dimensions to make them compact spaces.
2) Physics: In string theory, the process of "curling up" the extra dimensions (six in the superstring theory). According to these theories, the Universe actually has 10 spatial dimensions but that 7 of them have become "compactified" down to subatomic size and thus are unobservable.

Compactification, n. from → compactify.

compactify
  همپکانیدن   
hampakânidan

Fr.: compactifier   

Verbal form of → compactification.

Compactify, from → compact + -ify "cause to become," M.E. -fien, from O.Fr. -fier, from L. -ficare, root of facere "to make, do;" PIE base *dhe- "to put, to do" (cf. Skt. dadhati "puts, places;" Av. dadaiti "he puts," O.Pers. ada "he made," Gk. tithenai "to put, set, place."

compaction
  همپکش   
hampakeš

Fr.: compactage   

1) The act of compacting or the state of being compacted.
2) Geology: The physical process whereby the volume of a fixed mass of sediment reduces either by the weight of overlying deposits or by the pressure of earth movements.

compact; → -tion.

compactness
  همپکی، همپکیدگی   
hampaki, hampakidegi

Fr.: compacité   

1) General: The quality of being compact.
2) For a → compact object, a rough measure of the importance of gravity, defined by a dimension-less quantity which is the ratio between its gravitational radius (→ Schwarzschild radius) and its physical radius. It is expressed as φ = 2 GM / c2 R, where M and R are the mass and radius of the object respectively, and G and c are the → gravitational constant and speed of light respectively. For a → black hole  φ is of order unity (by definition), for a → white dwarf it is of order 10-4, and for a → neutron star  φ is around 0.5.

compact + → -ness.

companion
  همدم   
hamdam (#)

Fr.: compagnon   

The fainter of the two components in a → binary system.

Companion from O.Fr. compaignon "fellow, mate," from L.L. companionem, lit. "bread fellow, messmate," from L. → com- "with" + panis "bread."

Hamdam "bearthing together, i.e. an intimate companion, friend," from ham- "with", → com- + dam "breath," Mod.Pers./Mid.Pers. damidan "to breathe, blow," Av. dāδmainya- "blowing up," cp. Skt. dham- "to blow," dhamati "he bows," Proto-Indo-Iranian *dhamH-, Proto-Iranian *damH- "to blow, breathe; to swell," PIE *dhemH- "to blow."

companion of Sirius
  همدم ِ تیشتر   
hamdam-e Tištar

Fr.: compagnon de Sirius   

A faint star of 8th magnitude in a binary system with → Sirius. Called also Sirius B, it is a → white dwarf with a mass comparable to that of the Sun, but with a diameter smaller than that of the Earth. The mean distance between the stars is about 20 A.U. (angular separation 4.6 seconds of arc), and their period of revolution about 50 years. This star was discovered in 1844 by Friedrich Bessel, who noticed that Sirius had a slight wobbling motion, as if it was orbiting an unseen object. In 1863, the optician and telescope maker Alvan Clark spotted the companion. The star was later determined to be a → white dwarf.

companion; → Sirius.

comparative
  همسنجشی   
hamsanješi (#)

Fr.: comparatif   

1) Of or relating to comparison.
2) Proceeding by, founded on, or using comparison as a method of study.
3) Grammar: Being, noting, or pertaining to the intermediate degree of the comparison of adjectives, as better and more beautiful, the comparative forms of good and beautiful, and of adverbs, as nearer and more carefully, the comparative forms of near and carefully (Dictionary.com).

comparison; → -ive.

comparator
  هم‌سنجگر   
hamsanjgar

Fr.: comparateur   

A device that compares the measured property of an object (position, shape, color, brightness) with a standard. → blink comparator.

L.L. comparator "comparer," from compara, → compare, + -tor suffix forming personal agent nouns, cf. Gk. -tor, Skt. -tar.

Hamsanjgar, agent noun from hamsanjidancomparison.

compare
  هم‌سنجیدن   
hamsanjidan (#)

Fr.: comparer   

To examine in order to note similarities and differences.

From O.Fr. comparer, from L. comparare "to match, make equal with, liken," from → com- "with" + parare "to make or esteem equal," from par "equal."

Sanjidan "to compare; to measure," from Mid.Pers. sanjidan "to weigh," from present tense stem sanj-, Av. θanj- "to draw, pull;" Proto-Iranian *θanj-. Other terms from this base in Pers.: lanjidan "to pull up," hanjidan, âhanjidan "to draw out," farhang "education, culture."

comparison
  هم‌سنجش   
hamsanješ (#)

Fr.: comparaison   

The act of comparing or the process of being compared.

From O.Fr. comparaison from L. comparationem, from p.p. stem of comparare, → compare.

Hamsanješ, from hamsanj present tense stem of hamsanjidan, → compare, + verbal noun suffix.

comparison spectrum
  بیناب ِ هم‌سنجش   
binâb-e hamsanješ

Fr.: spectre de comparaison   

A spectrum of known substances used as a standard of comparison for investigating spectra of celestial objects.

comparison; → spectrum.

comparison star
  ستاره‌ی ِ هم‌سنجش   
setâre-ye hamsanješ

Fr.: étoile de comparaison   

A non-variable star used to monitor the variations of another nearby star.

comparison; → star.

compass
  قطبنما   
qotbnemâ (#)

Fr.: compas magnétique   

A device for determining directions, as by means of a freely rotating → magnetic needle that indicates → magnetic north.

M.E. compas, from O.Fr. compas "circle, pair of compasses," from compasser "to go around, measure," from V.L. *compassare "to pace out," from L. → com- "together" + passus "a step."

Qotbnemâ, literally "pole indicator," from qotb, → pole, + nemâ "indicator, showing," from nemudan "to show," → display.

compass needle
  سوزن ِ قطبنما   
suzan-e qotbnemâ (#)

Fr.: aiguille de compas magnétique   

The needle in a → magnetic compass.

compass; → needle.

compasses
  پرگار   
pargâr (#)

Fr.: compas   

An instrument that consists of two arms, joined at the top, one arm of which serves as a stationary reference point or pivot, while the other describes a circle or is extended. It is used for measuring angles, transferring lengths, and drawing circumferences. Also pair of compasses.

compass.

Pargâr "a pair of compasses," from Proto-Ir. *pari-kar- "to draw around, to plough around," from *pari- "around, round about" (Mod.Pers. par-, pirâ-, cognate with Gk. peri-), → circum-, + *kar-, karš- "to draw (a furrow), till, plant" (Mod.Pers. kašidan "to draw," kâštan, kâridan "to plant"); Lori, Hamadâni kerr "line, scratch;" Laki keronen, Hamadâni kerândan "to pull along, drag;" Tâleši kernye; Tabari kərəš "to drag;" cf. Av. pairikara- "a furrow round about," Skt. parikara- "girdle, waist-band, zone."

compatibility
  سازگاری   
sâzgâri (#)

Fr.: compatibilité   

General: The fact or conditions of existing or working together.
Informatics: The ability of a software or peripheral device to function with another computer or computer system without modification.

Noun from → compatible.

compatible
  سازگار   
sâzgâr (#)

Fr.: compatible   

Capable of existing harmoniously with another or others.
Informatics: of a software or peripheral device, capable of working with another computer or computer system without modification.

M.Fr. compatible, from M.L. compatibilis, literally "sympathetic," from L.L. compati, from → com- "together" + pati "to suffer, undergo;" PIE base *pe(i)- "to hurt" (cf. Skt. pijati "reviles, scorns," Gk. pema "ruin, affliction," Av. pâman- "scab; skin disease") + -ible, → -able.

Sâzgâr variant sâzkâr "consonant, in accordance, agreeing," from sâz- present tense stem of sâzidan, sâxtan "to adapt, adjust, be fit; to build, make, fashion," Mid.Pers. sâxtan, sâz-, Manichean Parthian s'c'dn "to prepare, to form," Av. sak- "to understand, to mark," sâcaya- (causative) "to teach;" + agent suffix -gâr, variant -kâr, O.Pers. kara-, O.Pers./Av. kar- "to do, make, build," Av. kerenaoiti "makes," cf. Skt. kr- "to do, to make," krnoti "makes," karma "act, deed;" PIE base kwer- "to do, to make."

<< < -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 coa coe 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 cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep 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-f Ear ecl eco edu eig Ein ela ele ele ele Ele elo emi emp ene Enl env epi equ equ Eri est Euc eva evo exc exc exh Exo exp exp ext ext f(R fac fam fat fee Fer Fib fig fin fir fix fle flu foc for for for fra fre Fre fri fun fuz Gal gal gal Gam gau Gay gen Geo geo geo geo gim glo gov gra gra gra gra gre gro Gun hab hal han Har haz hea hel hel Hen Her het Hig hil hol Hoo hor hou Hub hum hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind Ind inf inf inf inf inn ins ins int int int int int int int int inv ion ion Irr iso iso iso jan jit Jul jus Kel ker kin kni La lam lan Lap las lat Lay Led Len let lif lig lin lin lin liq Lit loc log lon lou low lum lun Lym M d Mag mag mag mag mag mag maj man mar mas mas mat mea mea mec mem mer Mes met met mho mic Mie Mil min mis MKS MOd mol Mon moo mot mul mul myo nak Nas nat neb neg neu neu New New nit noi non non nor nor nuc nuc nul nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi pai Pan par par Par par pas Pav Pel per per per per Per per pha phi pho pho pho phy Pip Pla pla PLA pla ple plu pol pol pol pol pop pos pos pot Pra pre pre pre Pri pri pri pro pro pro pro pro pro pro Pto pul pur qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea rea rec rec red red ref ref reg rel rel rel rep res res res res ret RHB rid rig ris roc Ros rot rub Rut Sag sam sat sca sca Sch sci Sea sec sec see sel sem sen set Sha sha shi shu sid sil sim sin SIS ski Slo smo Soc sol sol sol sol son sou spa spa spe spe spe sph spi spi Spo squ sta sta sta sta Ste ste ste sto str str str sub sub suc sun sup sup sup sup sur Swa syn syn tab tar tel tem ter tes the the the the Tho thr tid tim Tit top tot tra tra TRA tra tre tri tri tru Tun Tus tym Typ ult unb und uni uni uns upp Urs vac van var Vei Ven ver vic Vir vir vis vol W 4 war wat wav wea wed wet wid win WN2 Wol wri xen yok zen zin > >>