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: 13046 Search : far
ferrous iron
  آهن ِ فرور   
âhan-e fervar

Fr.: fer ferreux, fer bivalent   

Iron in a plus-2 → oxidation state.

ferrous; → iron.

fertile
  بارور   
bârvar (#)

Fr.: fertile   

Physics: (of nuclear material) Able to become → fissile by → neutron capture.

M.E., from M.Fr. fertil, from L. fertilis "bearing in abundance, fruitful, productive," from ferre "to bear," from PIE root *bher- "to carry," also "to bear children," cognate with Pers. bordan "to carry, bear," → refer.

Bârvar, literally "fruitful," from bâr "fruit; flower; load; charge" + possession suffix -var, related to bordan "to bear, carry," as above.

fertile isotope
  ایزوتوپ ِ بارور   
izotop-e bârvar

Fr.: isotope fertile   

An → isotope not itself → fissile but that is converted into a fissile isotope, either directly or after a short → decay process following absorption of a → neutron. Example: U-238 can capture a neutron to give U-239. U-239 then decays to Np-239 which in turn decays to fissile Pu-239. The most important fertile isotope is U-238. This is by far the most abundant isotope of natural uranium, making up 99.28%. The important transformation chain is: 92U238 + 0n193Np239 + β- (23.5 minutes) → 94Pu239 + β- (2.36 days).

fertile; → isotope .

Feynman diagram
  نمودار ِ فاینمن   
nemudâr-e Feynman

Fr.: diagramme de Feynman   

A schematic representation, in quantum electrodynamics and quantum chromodynamics, of the way elementary particles like electrons and protons interact with each other by exchanging photons. Use of Feynman diagrams can greatly reduce the amount of computation involved in calculating a rate or cross section of a physical process.

After the American physicist Richard P. Feynman (1918-1988), Nobel prize 1965; → diagram.

FHB star
  ستاره‌ی ِ FHB   
setâre-ye FHB

Fr.: étoile FHB   

Same as → field horizontal branch star.

field; → horizontal; → branch; → star.

fiber
  فیبر   
fibr (#)

Fr.: fibre   

optical fiber.

From Fr. fibre, from O.Fr. fibre, from L. fibra "a fiber, filament," of uncertain origin, perhaps related to L. filum "thread."

Fibr, loan from Fr., as above.

Fibonacci number
  عدد ِ فیبوناچی   
'adad-e Fibonacci

Fr.: nombre de Fobonacci   

One of the numbers in the → Fibonacci sequence.

Fibonacci sequence; → number.

Fibonacci sequence
  پی‌آیه‌ی ِ فیبوناچی   
peyâye-ye Fibonacci

Fr.: suite de Fibonacci   

An infinite sequence of integers, starting with 0 and 1, where each element is the sum of the two previous numbers. For example: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ... As the sequence develops, the ratio of the consecutive terms converges to the → golden ratio, about 1.618.

Leonardo Pisano Fibonacci (1170-1250), medieval Italian mathematician who wrote Liber abaci (1202; Book of the Abacus), the first European work on Indian and Arabian mathematics, which introduced "Arabic" numerals in Europe; → sequence.

fibril
  تارچه   
târcé (#)

Fr.: fibrille   

A linear pattern in the → chromosphere of the → Sun, as seen through an → H-alpha filter, occurring near strong → sunspots and → plages or in → filament channels. They are magnetically confined tubes of hot → plasma. Individually, they are about 10,000 km long and last for 10 to 20 minutes.

From Mod.L. fibrilla, from fibr(a) "fiber" + -illa diminutive suffix.

Târcé, from târ "thread, warp, → string" + diminutive suffix -cé, from Mid.Pers. -cak, variants -êžak (as in kanicak "little girl," sangcak "small stone," xôkcak "small pig"), also Mod.Pers. -ak.

fibula
  نازک-نی   
nâzok-ney

Fr.: péroné   

Anatomy: The outer and thinner of the two bones of the human leg, extending from the knee to the ankle.

Fom L. fibula "clasp, brooch; bolt, peg, pin," related to figere "to drive in, insert, fasten," → fix.

Nâzok-ney, literally "fine reed," from nâzok "→ fine" + ney "reed, pipe, flute."

fiction
  دیزن   
dizan

Fr.: fiction   

1) Literary works invented by the imagination, such as novels or short stories.
2) An invented story or explanation; lie.
3) The act of inventing a story or explanation.
4) Law: Something assumed to be true for the sake of convenience, though probably false (Dictionary.com).

M.E., from O.Fr. ficcion "dissimulation, ruse; invention, fabrication" and directly from L. fictionem "a fashioning or feigning," noun of action from p.p. stem of fingere "to shape, form, devise, feign," originally "to knead, form out of clay," from PIE *dheigh- "to build, form, knead;" akin to Skt. dehah "body," literally "that which is formed," dih- "to besmear;" Gk. teikhos "wall;" L. fingere "to form, fashion," Gothic deigan "to smear;" O.Irish digen "firm, solid."

Formed on the model of fiction, as above, from diz- "to build, to form;" (related to Pers. dež, dez "fortress"); cf. Mid.Pers. dys-/dēs- "to build;" Sogd. dys "to build;" Av. (+ *pari-) daēz- "to build (around);" Proto-Ir. *daiz- "to build, form;" from PIE *dheigh- "to build, form," as above, + suffix -an.

field
  میدان   
meydân (#)

Fr.: champ   

1) General: An expanse of anything.
2) Physics: A region or space defined by the presence of a physical force, such as electric, magnetic, or gravitational.
3) Math.: A mathematical entity for which addition, subtraction, multiplication, and division are well-defined.

M.E., from O.E. feld "plain, open land," probably related to O.E. folde "earth, land," from P.Gmc. *felthuz "flat land" (cf. Ger. Feld), from PIE *pel(e)-tu-,from base *pele- "flat, to sprea;" cf. L. planus "flat, level," → plane.

Meydân "field, field of battle, arena, extensive plain," from Mid.Pers. mêdân "arena, field." This term is loaned into Ar. from Pers. or Mid.Pers.

field curvature
  خمیدگی ِ میدان   
xamidegi-ye meydân (#)

Fr.: courbure de champ   

An aberration in an optical instrument, common in Schmidt telescopes, in which the focus changes from the center to the edge of the field of view. Owing to this aberration, a straight object looks curved in the image.

field; → curvature.

field equation
  هموگش ِ میدان   
hamugeš-e meydân

Fr.: équation de champ   

In a physical theory, an equation that describe how a fundamental force interacts with matter. Einstein's equations of → general relativity are called field equations since they describe the → gravitational field. Similarly, → Maxwell's equations describe the electromagnetic field.

field; → equation.

field galaxy
  کهکشان ِ میدان   
kahkešân-e meydân

Fr.: galaxie de champ   

A galaxy that lies in the direction of a → cluster of galaxies, but is not a member of the cluster. Field galaxies are rare, less than about 5% of all galaxies.

field; → galaxy.

field horizontal branch star
  ستاره‌ی ِ شاخه‌ی ِ افقی ِ میدانی   
setâre-ye šâxe-ye ofoqi-ye meydâni

Fr.: étoile de la branche horizontal du champ   

A → horizontal branch star with high velocity.

field; → horizontal; → branch; → star.

field lens
  عدسی ِ میدان   
adasi-ye meydân

Fr.: lentille de champ   

A lens placed at or near the focal plane of a telescope to create an image of the primary mirror inside the instrument.

field; → lens.

field O star
  ستاره‌ی ِ Oی ِ میدان   
setâre-ye O-ye meydân

Fr.: étoile O de champ   

An → O-type star which is apparently not associated with a → star cluster. A significant fraction of → massive stars in the → Milky Way and other galaxies are located far from star clusters and → star-forming regions. It is known that some of these stars are → runaways, i.e. possess high → space velocities (determined through the → proper motion and/or → radial velocity measurements), and therefore most likely were formed in embedded clusters and then ejected into the field because of dynamical interactions or → binary-→ supernova explosions. However, there exists a group of field O stars whose runaway status is difficult to prove via direct proper motion measurements or whose low space velocities and/or young ages appear to be incompatible with their large separation from known star clusters. The existence of this group led some authors to believe that these stars can form → in situ. The question of whether or not O stars can form in isolation (→ isolated massive star formation) is of crucial importance for → star formation models (Gvaramadze et al., 2012, MNRAS, 424, 3037).

field; → O star.

field object
  بر‌آخت ِ میدان   
barâxt-e meydân

Fr.: objet de champ   

An astronomical object that is seen in the direction of a group but not physically belonging to the group. → field galaxy.

field; → object.

field of force
  میدان ِ نیرو   
meydân-e niru (#)

Fr.: champ de force   

The region of → space surrounding a body, such as a mass of → matter, a → charged particle, or a → magnet, within which it can exert a → force on another similar body not in contact with it.

field; → force.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara arc Ari arr Asi ass ast ast asy atm ato att aut ave axi Bab bal ban bar bar bea Bel Bes bia Big bin bin bip Bla bla bli blu Boh Bon bos Bou bra bri bro bur cal cal can Cap car Car cat Cau cea Cen cen cha Cha cha che chi chr cir cir civ cla clo clo CMB 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 cop Cor CoR cor cos cos Cou cou CP- cre cri cro cub cur cya Cyg dan dar dau de- deb dec dec dee def deg del den den dep des deu dew dia dif dif dih dip dir dis dis dis dis dis diu doc dop dou DQ dry dus dwa dyn Dys 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 eye fac fal Far fed Fer fer fie fin fir fit fla flo flu fol for for Fou fra fre Fre fro fuz gai Gal Gal gam gas Gau gen gen geo geo geo gia glo gol gra gra gra gra gre gri gui H I hai Ham har Hau hea hec hel hel her HES hie hig his hom hor hot Hub Hul Huy hyd hyd hyl hyp ice ide ima imm imp imp inc ind ind ine inf inf inf inh inn ins ins int int int int int int int int inv ion ion Irr iso iso iso Jal JHK Jul jur Kel Kep kin kne L d Lag lam Lap lar lat law Lea len lep lib lig lin lin lin liq lit loc log lon Los low lum lun Lut Lyr mac mag mag mag mag mag maj man Mar mas mas mat Max mea mec mel Mer Mes met met met mic mid Mil min mir mix mod mod mol mon mor mov mul muo mys nan nat Nav nec nep neu new New NGC Noa nom non non nor not nuc nuc num nyc obj obs obs oce odd OH Omi Oor ope opt opt opt orb ord Ori ort osc out ove oxi pai pan par Par Par par pas pea Pen per per per per Per per pha phl pho pho pho phy Pip Pla pla PLA pla ple plu pol pol pol pol pop pos pos pot Pra pre pre pre pre pri pri pro pro pro pro pro pro pro pse pul pur qua qua qua qua qui rad rad rad rad rad rad raf ran rar ray rea rea rec rec red red ref ref reg rel rel rel rep res res res res ret rev ric rig rin roc ROS rot Rox rus Sad sal sat sca sca Sch sci scy sec sec see sel sem sen Ser sex Sha she sho sid sig sil sim sin siz sle SMA SNR Sof sol sol sol sol sou Sou spa Sp spe spe spe sph spi Spi spr sta sta sta sta sta ste ste ste sto str str Sty sub sub suc sun sup sup sup sup sur Swa syn syn tac tas tel tem ter tes the the the the Tho thr tid tim Tit top tot tra tra TRA tra tre tri tri tru tum tur TY Typ ult una und uni uni uno upp urg UX Van var veg vel ver vib vio vir vis Voi vow wan wat wav WC wea wel whi Wil wir WNh wor X-r yel ytt zer zon > >>