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: 12948 Search : far
pyroxene
  پیرکسن   
piroksen (#)

Fr.: pyroxène   

One of the major groups of silicate minerals found in many igneous and metamorphic rocks. Pyroxene minerals are also common in meteorites. There are many different types of pyroxene. All of the types contain Si2O6 but some have sodium (Na) while others have iron (Fe), magnesium (Mg), or a combination of these three elements.

From → pyro- "fire," + xeno- a combining form meaning "alien, strange, guest," from Gk. xenos "stranger, guest." Pyroxene was originally supposed to be a foreign substance when found in igneous rocks.

Pythagorean theorem
  فربین ِ پوتاگوراس، ~ فیساغورس   
farbin-e Pythagoras, ~ Fisâqures

Fr.: théorème de Pythagore   

The proposition that the → square of the → hypotenuse of a → right triangle is equal to the → sum of the squares of the other two sides: a2 + b2 = c2.

After Pythagoras (c570 BC-c495BC), Greek philosopher and mathematician; → theorem.

Pythagorean triple
  سه‌تایه‌ی ِ پوتاگوراس، ~ فیساغورس   
setâye-ye Pythagoras, ~ Fisâqures

Fr.: triplet de Phythagore   

Any group of three → integers that satisfy the relations specified by the → Pythagorean theorem. Some examples: 3, 4, and 5; 5, 12, and 13; 8, 15, 17.

Pythagorean theorem; → triple; → triplet.

Pyxis
  قطب-نما   
qotb-namâ (#)

Fr.: Boussole   

The Compass Box. A faint constellation in the southern hemisphere, at 9h right ascension, 30° south declination, representing a mariner's compass. Its brightest star, Alpha Pyxidis, is magnitude 3.7. Abbreviation: Pyx; genitive: Pyxidis.

L. pyxis, from Gk. pyxis "box."

Qotbnamâ literally "pole indicator," from qotb, → pole, + namâ "displayer, indicator," from nemudan "to show" (Mid.Pers. nimūdan, nimây- "to show," from O.Pers./Av. ni- "down; into" (Skt. ni "down," nitaram "downward," Gk. neiothen "from below," cf. E. nether, O.E. niþera, neoþera "down, downward, below, beneath," from P.Gmc. *nitheraz, Du. neder, Ger. nieder; PIE *ni- "down, below") + māy- "to measure;" cf. Skt. mati "measures," matra- "measure;" Gk. metron "measure;" L. metrum; PIE base *me- "to measure").

Q index
  دیشن ِ Q   
dišan-e Q

Fr.: indice Q   

In the Johnson → UBV system, a reddening-free parameter which is related to the → effective temperature of stars and thus provides a useful, but rough, discriminant for → spectral types. It is expressed as: Q = (U - B) - 0.72 (B - V).

index.

quadrangle
  چهارگوشه، چارگوش   
cahârgušé, cârguš

Fr.: quadrilatère   

A two-dimensional figure that consists of four points connected by straight lines. Same as → tetragon; see also → quadrilateral.

L.L. quadrangulum, noun use of neuter of L. quadrangulus, quadriangulus "four-cornered," from quadr- variant of quadri- before a vowel "four," akin to quattuor, → four, cognate with Pers. cahâr, as below; → angle.

Cahârgušé, cârguš "four-cornered," from cahâr, câr "four," cognate with L. quattuor, → four, + gušé, guš "corner, angle;" Mid.Pers. gôšak "corner."

Quadrans Muralis
  چارکان   
Cârakân

Fr.: Quadrant   

An obsolete → constellation created by the French astronomer Jérôme Lalande in 1795. He named it such for the main astronomical instrument, that is → mural quadrant, he used. Quadrans Muralis was located between the constellations → Boötes and → Draco. The name disappeared from astronomical catalogs, but the → meteor showerQuadrantids has kept that name.

mural quadrant.

quadrant
  چارَکان   
cârakân

Fr.: quadrant   

1) A quarter of a circle; an arc of 90°.
2) Any of the four parts into which a plane is divided by a pair of rectangular axes.
3) An instrument, usually containing a graduated arc of 90°, formerly used in astronomy and navigation to measure the angles and altitudes of stars. → mural quadrant.

M.E., from L. quadrantem (nominative quadrans) "fourth part."

Cârakân, from cârak + -ân. Cârak "quarter," literally "fourth, a fourth part of one," from câr, variant of cahâr, → four, cognate with L. quattuor, + -ak, contraction of yak "one," from Mid.Pers. êwak (Proto-Iranian *aiua-ka-); O.Pers. aiva- "one, alone;" Av. aēuua- "one, alone" (cf. Skt. éka- "one, alone, single;" Gk. oios "alone, lonely;" L. unus "one;" E. one); -ân nuance suffix.

Quadrantids
  چارکانیان   
Cârakâniyân

Fr.: Quadrantides   

An annual → meteor shower reaching a peak about 3 January and having its → radiant in the constellation → Boötes.

From L. Quadrant-, from Quadrans Muralis , → mural quadrant.

quadratic
  چاروشی   
câruši

Fr.: quadratique   

Of or relating to or resembling a → square.
Of, relating to, or containing terms with powers no higher than the power of two.

Quadratic, adj. of quadrate, from L. quadratus p.p. of quadrare "to make square."

Câruši pertaining to câruš "square," from Av. caθruša- "four sides (of a four-sided figure)," from caθru- "four," Mod.Pers. cahâr, câr "four," cognate with L. quattuor, → four.

quadratic equation
  هموگش ِ چاروشی   
hamugeš-e câruši

Fr.: équation quadratique   

An equation with the general form of ax2 + bx +c = 0, in which the highest power of the unknown is the second power (square).

quadratic; → equation.

quadratic formula
  دیسول ِ چاروشی   
disul-e câruši

Fr.: formule quadratique   

A formula relating the unknown part of a → quadratic equation to the known parts.

quadratic; → formula.

quadrature
  ۱) چاروشش، چاروشی؛ ۲) نوَدان، چاروشش   
1) cârušeš, câruši; 2) navadân, cârušeš

Fr.: quadrature   

1) General: The process of making something square; the act of squaring.
2) Math.: The act or process of constructing a → square with an area equal to that of a specified surface, especially a surface bounded by a curve.
3) Astro.: The position of a planet or the Moon when it makes a 90° angle with the Sun as seen from Earth.

From L. quadratura, from quadrat(us) p.p. of quadrare "to make square."

1) Cârušeš verbal noun of cârušidan "to square," from câruš "square," from Av. caθruša-, → quadratic.
Câruši quality noun of câruš "square," as preceding.
2) Navadân, from navad "ninety," referring to the longitude difference of 90° (Mid.Pers. nawad; Av. nauuaiti- "ninety," from nauua- "nine" (Mod.Pers. noh); cf. Skt. navati- "ninety") + -ân suffix of place and time.

quadrature of the circle
  چاروشش ِ پرهون، ~ ِ دایره   
cârušeš-e parhun, ~ dâyeré

Fr.: quadrature du cercle   

Constructing a square whose area equals that of a given circle. This was one of the three geometric problems of antiquity. It was finally proved to be an impossible problem when π was proven to be transcendental by Lindemann in 1882. Same as → squaring the circle.

quadrature; → circle.

quadrilateral
  چهاربر، چاربر   
cahârbar (#), cârbar(#)

Fr.: quadrilatère   

A plane figure bounded by four straight lines.

From L. quadrilater(us) "four-sided," from L. quattuor, → four, + → lateral.

quadruple
  چهارتا، چهارتایی   
cahârtâ (#), cahârtâyi (#)

Fr.: quadruple   

Fourfold; consisting of four parts.

M.E. from L. quadruplus, from quadru- + duple, from duplus, from du(o) "two" + -plus "fold."

Cahârtâ, from cahâr, → four, cognate with L. quattuor, + "fold, plait, ply; piece, part" (Mid.Pers. tâg "piece, part").

quadruple system
  راژمان ِ چهارتایی   
râžmân-e cahârtâyi

Fr.: système quadruple   

A stellar system consisting of four stars orbiting around a common → center of mass.

quadruple; → system.

quadrupolar
  چهارقطبه، چهارقطبه‌ای   
cahârqotbé (#), cahârqotbe-yi (#)

Fr.: quadrupolaire   

Of or pertaining to a → quadrupole, especially a → quadrupole moment.

quadrupole + -ar, → -al.

quadrupole
  چهارقطبه   
cahârqotbé (#)

Fr.: quadrupôle   

A set of either two → electric dipoles or two → magnetic dipoles in close proximity to each other arranged with alternating polarities and acting as a single unit. Quadrupole interactions are much smaller than dipole interactions, but can allow transitions forbidden in dipole moment transitions.

From L. quadru-, variant of quadri- "four" + → pole, on the model of → dipole.

Cahâr, → four, + qotb, → pole + noun/nuance suffix .

quadrupole anisotropy
  نا-ایزوگردی ِ چهارقطبه   
nâ-izogardi-ye cahârqotbé

Fr.: anisotropie quadrupolaire   

The → anisotropy which is at the origin of the → cosmic microwave background polarization. The quadrupole anisotropy could arise from three types of perturbations: → scalar perturbation, → vector perturbation, and → tensor perturbation

quadrupole; → anisotropy.

<< < -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 div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>