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
Pollux (β Geminorum)
  پولوکس   
Polluks (#)

Fr.: Pollux   

The brightest star in the constellation → Gemini despite its designation as β. Also known as HR 2990 and HD 62509. Pollux lies about 4 degrees apart from the blue star → Castor with which it has no physical connection. Pollux is an orange-red star with a → visual magnitude 1.14 (B - V = +1.00) located about 34 → light-years away. It is a → giant star of → spectral type K0 III, with a mass of 2 Msun, a radius of about 10Rsun, a luminosity of 43 Lsun, and an → effective temperature of 4666 K. Pollux has a large planet, → Pollux b, with a mass of at least 2.3 times the mass of Jupiter.

Pollux, Gk. Polydeucus is one of the "Heavenly Twins," brother to → Castor, sons of Leda and Zeus.

Pollux, loan from L., as above. It has a too long Ar. name: Al-Ra's-at-Tau'am-al-Mo'akhkhar (الرأس‌التوأم‌المؤخر) "the head of the posterior twin," translating the Gk. mythological figure.

Pollux b
  پولوکس b   
Polluks b

Fr.: Pollux b   

An → extrasolar planet orbiting the bright star → Pollux (β Gem). It lies approximately 34 → light-years away in the constellation → Gemini. Called also → Thestias, it has a mass of at least 2.30 → Jupiter mass, and orbits Pollux at a distance of about 1.64 → astronomical units once every 590 days.

Pollux.

poloidal magnetic field
  میدان ِ مغناتیسی ِ قطبی‌وار   
meydân-e meqnâtisi-ye qotbivâr

Fr.: champ magnétique poloïdal   

1) In → protoplanetary disk models, the magnetic field whose large-scale lines of force depart away from the → accretion disk, in the direction of the rotation axis.
2) In a → tokamak, the magnetic field produced by a current flowing in the → plasma vertically to the toroid plane. → toroidal magnetic field.

pole; → -oid; → magnetic field.

polonium
  پولونیوم   
poloniom (#)

Fr.: polonium   

A radioactive chemical element; symbol Po. Atomic number 84; mass number of most stable isotope 209; melting point 254°C; boiling point 962°C.

The name derives from Poland, the native country of Marie Sklodowska Curie. It was discovered by Pierre and Marie Curie in 1898, from its radioactivity.

poly-
  بُل-، چند-   
bol- (#); cand- (#)

Fr.: poly-   

A prefix denoting "much, many."

From Gk. poly-, combining form of polus "much," cognate with L. plus, Pers. bol-, as below; from PIE base *pel- "to be full."

Bol- "much; very; many," as in examples bolkâmé "desirous" (literally "with much desire"), bolhavas, variant porhavas "very desirous, libidinous" (literally "with much lust"); variant of por "full, much, very," Mid.Pers. purr "full;" O.Pers. paru- "much, many;" Av. parav-, pauru-, pouru- "full, much, many," from par- "to fill;" PIE base *pelu- "full," from *pel- "to be full;" cf. Skt. puru- "much, abundant;" Gk. plethos "great number, multitude;" O.E. full.
Cand-, from cand "how many, how much; so many; several; some; much;" Mid.Pers. cand "how many?, so many; much; some;" O.Pers. yāvā "as long as;" Av. yauuant- [adj.] "how great?, how much?, how many?," yauuat [adv.] "as much as, as far as;" cf. Skt. yāvant- "how big, how much;" Gk. heos "as long as, until."

polychromatic
  بُلفام   
bolfâm

Fr.: polychromatique   

Having or exhibiting a variety of colors.

poly-; → chromatic.

polycyclic aromatic hydrocarbons (PAHs)
  هیدروکربورهای ِ اروماتیک ِ پلی‌سیکلیک، ~ ~ بُل‌چرخه‌ای   
hidrocarburhâ-ye aromâtik-e polisiklik, ~ ~ bol-carxe-yi

Fr.: hydrocarbures aromatiques polycycliques   

1) Chemistry: A family of → organic molecules composed of carbon and hydrogen atoms (→ hydrocarbons) in which → carbon atoms appear in multiple loops (polycyclic) with strong chemical → bonds that exist between them (aromatic). PAHs are formed during the incomplete burning of coal, oil and gas, garbage, or other organic substances like tobacco or charbroiled meat. As a pollutant, they are of concern because some compounds (benzo(a)pyrene) have been identified as tending to cause cancer.
2) Astro.: Strong → infrared emission features at 3.3, 6.2, 7.7, 8.6, and 11.2 microns, which are attributed to PAH molecules in the form of → dust grains with radii smaller than 10 Å. PAHs are common toward various sources characterized by a strong → ultraviolet radiation field (such as → active galaxies, → reflexion nebulae, → planetary nebulae, → H II regions). In particular, they trace the presence of → massive stars. The PAH features are thought to result from the fluorescent emission process of PAH molecules and ions excited by ultraviolet radiation of nearby stars. PAHs are likely produced by → photoevaporation of → very small grains.

poly-; → cyclic; → aromatic; → hydrocarbon.

polydeism
  بل‌دادارباوری، چنددادارباوری   
bol-dâdâr-bâvari, cand-dâdâr-bâvari

Fr.: polydéisme   

A kind of → deism according to which multiple deities created the Universe, but do not interact with the physical world. → polytheism.

poly-; → deism.

polygon
  چندبر   
candbar (#)

Fr.: polygone   

A one-dimensional closed figure consisting of a series of points, each of which is called a → vertex, and the line segments, called → sides, joining the vertices. Polygons of three sides are called → triangles, and of four sides → quadrilaterals.

poly- + → -gon.

polyhedron
  بلدیمه   
boldimé

Fr.: polyèdre   

1) Geometry: A three-dimensional figure formed by several → polygons.
2) A set P ⊆ ℜn is a polyhedron if there is a system of finitely many unequalities Ax ≤ b such that P = {x ∈ ℜn | Ax ≤ b}.

poly-; → hedron.

polynomial
  بُلنامین   
bolnâmin

Fr.: 1) polynôme; 2) polynomial   

1) A mathematical expression involving a sum of powers in one or more variables multiplied by coefficients.
2) Consisting of or characterized by two or more terms or names.

From → poly- + (bi)nomial, contraction of → nominal.

polynomial equation
  هموگش ِ بلنامین   
hamugeš-e bolnâmin

Fr.: équation polynomiale   

An equation of the form a0 + a1x + a2x2 + ... + anxn, where a0 ... an are → real numbers and an≠ 0. Same as → algebraic equation.

polynomial; → equation.

polysemy
  بلچمی   
bolcemi

Fr.: polisémie   

Diversity of meanings.

From N.L. polysemia, from L. polysemus "with many significations" (from Gk. polysemos, from → poly- + sem, from sema "sign," → semantic, + adj. suffix -os), + -ia.

Bolcemi, from bol, → poly-, + cem, → meaning, + noun suffix -i.

polytheism
  بل‌یزدان‌باوری، چندیزدان‌باوری   
bol-yazdân-bâvari, cand-yazdân-bâvari

Fr.: polythéisme   

The doctrine of or belief in more than one god or in many gods (Dictionary.com). → polydeism.

poly-; → theism.

polytrope
  بُلگشت   
bolgašt

Fr.: polytrope   

In astrophysics, a gaseous sphere in hydrodynamic equilibrium in which the pressure and density are related by the equation P = Kρ(n+1)/n at each point along the radius, where K is a constant and n is the → polytropic index. The constant K depends upon the nature of the polytrope. Before the advent of computing technology, the theory of polytropes played an important role in physically modeling the structure of stars. → Lane-Emden equation.

Polytrope, from → poly- + trope, from → -tropic.

Bolgašt, from bol-, → poly-, + gašt "change, alteration," → -tropic.

polytropic
  بُلگشتی   
bolgašti

Fr.: polytropique   

1) Math.: Describing a function which has different values for one variable.
2) Thermodynamics: Pertaining to pressure and volume change that maintains specific heat. → polytropic process.

poly- + → -tropic.

polytropic change
  دگرشد ِ بُلگشتی، دگرش ِ ~   
degaršod-e bolgašti, degareš-e ~

Fr.: changement polytropique   

A change in the → pressure or → volume of a → gas in a → polytropic process.

polytropic; → change.

polytropic gas
  گاز ِ بُلگشتی   
gâz-e bolgašti

Fr.: gaz polytropique   

A gas capable of undergoing a → polytropic process.

polytropic; → gas.

polytropic index
  دیشن ِ بُلگشت   
dišan-e bolgašt

Fr.: index polytropique   

A number appearing in the equation describing a → polytropic process.

polytropic; → index.

polytropic process
  فراروند ِ بُلگشتی   
farâravand-e bolgašti

Fr.: processus polytropique   

A thermodynamic process that obeys the relation: PVn = C, where P is pressure, V is volume, n is any real number, called the → polytropic index, and C is a constant.
If n = 0, then P = C and it is an → isobaric process.
If n = 1, then for an → ideal gas PV = NkT = C and it is an → isothermal process.
If n = γ, → adiabatic index, then for an ideal gas it is an → adiabatic process.

polytropic; → process.

<< < -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 > >>