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: 12974 Search : far
flowability
  تچندگی   
tacandegi

Fr.: aptitude à s'écouler, coulabilité   

The ability of a body of matter (liquid, gas, loose particulate solid) to flow.

From flowable, adj. from → flow + → -able + → -ity.

Tacandegi, from tacandé (originally tacandag), agent noun of tacidan, → flow, + noun suffix -i.

fluctuate
  افتاخیزیدن، افتاخیز کردن   
oftâxizidan, oftâxiz kardan (#)

Fr.: fluctuer   

To change continually; to shift back and forth; vary irregularly; to rise and fall in or as if in waves.

From L. fluctuationem (nom. fluctuatio), from fluctuare "to undulate," from fluctus "wave," from p.p. of fluere "to flow."

Verbal form of oftâxiz, → fluctuation.

fluctuation
  افتاخیز   
oftâxiz (#)

Fr.: fluctuation   

Continual rise and fall.

Verbal noun of → fluctuate.

Oftâxiz "fall and rise," from oft "fall" stem of oftâdan "to fall" (Mid.Pers. opastan "to fall," patet "falls;" Av. pat- " to fly, fall, rush," patarəta- "winged;" cf. Skt. patati "he flies, falls," pátra- "wing, feather, leaf;" Gk. piptein "to fall," pterux "wing;" L. penna "feather, wing;" O.E. feðer "feather;" PIE base *pet- "to fly, rush") + -â- interfix + xiz present stem of xâstan, xizidan "to rise, get up" (Mid.Pers. xyz- "to stand up, rise;" Proto-Iranian *xiz- "to rise, ascend; increase").

fluff
  کرک   
kork (#)

Fr.: duvet   

1) Light, downy particles, as of cotton.
2) A soft, light, downy mass (Dictionary.com).

Apparently a variant of floow "wooly substance, down, nap," perhaps from Flemish vluwe, from Fr. velu "shaggy, hairy," from L. vellus "fleece," or L. villus "tuft of hair" (Online Etymology Dictionary).

Kork "down, soft wool, fluff," of unknown etymology.

fluffy
  کرکوار، کرکی   
korkvâr, korki

Fr.: duveteux, bouffant   

Of, resembling, or covered with fluff.
2) Light or airy (Dictionary.com).

From → fluff + -y adj. suffix, from O.E. -ig, cognate with L. -icus, → -ic.

Korkvâr "resembling fluff," with -vâr, a suffix of possession, similarity, and aptitude (e.g., omidvâr, sezâvâr, sugvâr, šâhvâr, gušvâr), → -oid; korki adj. with -i.

fluffy dust grain
  دانه‌ی ِ غبار ِ کرکوار   
dâne-ye qobâr-e korkvâr

Fr.: grain de poussière duveteux   

An aggregate of small particles loosely stuck together. Same as → porous dust grain.

fluffy; → dust; → grain.

fluid
  شاره   
šâré (#)

Fr.: fluide   

A continuous, amorphous substance whose molecules move freely past one another and that has the tendency to assume the shape of its container; collective term for liquids and gases.

From L. fluidus "fluid, flowing," from fluere "to flow;" → flux.

Šârré, from šârr, → flux.

fluid dynamics
  توانیک ِ شاره‌ها   
tavânik-e šârehâ

Fr.: dynamique des fluides   

The branch of → fluid mechanics that deals with the movement of gases and liquids.

fluid; → dynamics.

fluid mechanics
  مکانیک ِ شاره‌ها   
mekânik-e šârehâ

Fr.: mécanique des fluides   

The branch of physics that extends the ideas developed in → mechanics and → thermodynamics to the study of motion and equilibrium of → fluids.

mechanics; → fluid.

fluidity
  شارگی   
šâregi

Fr.: fluidité   

The ability of a substance to flow; reciprocal of → viscosity.

fluid + → -ity.

fluorescence
  فلوءورستی   
fluoresti

Fr.: fluorescence   

A type of → luminescence in which photons of lower energy are emitted as the result of absorption of energy by an atom or molecule from other radiation. The phenomenon lasts as long as the stimulus responsible for it is present.

Coined by English mathematician and physicist Sir George G. Stokes (1819-1903) from fluor-, from → fluorspar, + → -escence, a suffix of nouns denoting action or process, change, state or condition, etc.

fluorescent
  فلوءورست   
fluorest

Fr.: fluorescent   

Possessing the property of → fluorescence.

fluorescence; → -escent.

fluorescent lamp
  لامپ ِ فلوءورست   
lâmp-e fluorest

Fr.: ampoule fluorescente   

A tubular → electric discharge lamp in which light is produced by the → fluorescence → phosphors coating the inside of the tube.

fluorescent; → lamp.

fluoride
  فلوءورید   
fluorid

Fr.: fluorure   

A compound (salt of hydrofluoric acid) containing → fluorine.

fluorine; → -id.

fluorine
  فلوءور   
fluor (#)

Fr.: fluor   

Gaseous chemical element; symbol F. It is the most reactive of all chemical elements. It is a yellowish, corrosive gas, which reacts with most organic and inorganic substances. → Atomic number 9; → atomic weight 18.9984; → melting point -219.62 °C; → boiling point -188.14 °C; → density 1.696 grams per liter at STP; → valence -1. Fluorine and its compounds are used in producing uranium (from the → hexafluoride) and more than 100 commercial fluorochemicals, including many high-temperature plastics.

From L. fluere "flow, → flux," since fluorspar (CaF2) was used as a flux in metallurgy because of its low melting point. It was discovered in hydrofluoric acid by the Swedish pharmacist and chemist Carl-Wilhelm Scheele in 1771 but it was not isolated until 1886 by the French pharmacist and chemist Ferdinand Moisson.

fluorite
  فلوءوریت   
fluorit

Fr.: fluorite, fluorine   

A → mineral composed of calcium fluoride, CaF2, also called → fluorspar, that is often → fluorescent under → ultraviolet light.

From fluor-, → fluorine, + → -ite.

fluorspar
  فلوءوریت   
fluorit

Fr.: fluorine   

Same as → fluorite.

From fluor-, → fluorine, + spar "a crystalline mineral."

flux
  شار   
šâr (#)

Fr.: flux   

The amount of energy, fluid, or particles passing in a given direction in a unit of time.

O.Fr. flux, from L. fluxus, p.p. of fluere "to flow," PIE base *bhleug- (cf. L. flumen "river;" Gk. phluein "to boil over, bubble up," phlein "to abound").

Šâr "outpouring of water, wine, etc.," šâridan "to flow (as rivers), with a great noise; to pour," âbšâr "waterfall;" saršâr "overflowing; brim-full;" Ossetic ægzælyn "to pour down;" Pashto zγâstəl/zγâl- "to swim;" Av. γžār- "to flow;" cf. Skt. ksar- "to flow;" Gk. phtheirein "to destroy, perish."

flux calibration
  کبیزش ِ شار   
kabizeš-e šârr

Fr.: calibration de flux   

The → calibration of the flux received by a detector in terms of absolute units.

flux; → calibration.

flux density
  چگالی ِ شار   
cagâli-ye šârr

Fr.: densité de flux   

Flux of radiation that falls on a detector per unit surface area of the detector per unit bandwidth of the radiation per unit time.

flux; → density.

<< < -es -iv -ti 21- a p abe abs abs acc acc acc act act ada adi ads aes Age Alb Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app app arc Arg ari art ass ast ast ast atm ato att Aur aut axi azi bac Bal Bar Bar Bay Bec Ber bet bic bij bin bio Bir bla Bla blu blu bol Boo bou bra Bre bro bug C r cal Cal can car Car Cas cat cau cel cen cer Cha cha Cha che cho cir cir cir Cla cli clo clu co- cod 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 CSP cur cya Cyg dan dar dat de- deb dec dec dee def deg del dem den dep des det dev dia dif dif dih dip dir dis dis dis dis dis diu doc doo dou dow Dru 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 est 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 ful fuz Gal gal Gal gam gas Gau gen gen geo geo geo gib glo gos gra gra gra gra Gre gri gui H I hal Ham har Haw hea hei hel Hel her het hie hig Hob hom Hor hot Hub hum Huy hyd hyd hyp hyp ico if ima imp imp in- inc Ind ind ine inf inf inf ini ins ins int int int int int int int int int inv ion iro ise iso iso Jab jet Jov Jur Kee Kep kil Kis kry Lag lam lan Lar lat law lea lem lep Li lig lim lin lin lin lit loc loc lon Lor low lum lun Lup Lym mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec meg Mer Mer met met met mic mid mil Min Mir mix mod mod MOL mon mor mov mul mur N66 Nap nat nea neg Ner neu New New nic nod non non non nor nov nuc nul num O-t obl obs obt och off Ohm on- opa Oph opt opt ora orb ord Ori ort osc out ove ozo pal pan par par par par pat pec pen per per per per per Pfu pha pho pho pho phy pie pla Pla Pla pla pla Plo poi pol pol pol pol por pos pot pow pre pre pre pre pri pri pri pro pro pro pro Pro pro Pru pul pul Pyt qua qua qua qua quo rad rad rad rad rad rad ram Ran rat re- rea rec rec red red ref ref reg Reg rel rel rem rep res res res ret rev rho rif Rin Rob Rom rot rot rul S D Sai san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky Slo sno sof sol sol sol sol sor sou spa spa spe spe spe sph spi spi spr SS sta sta sta sta ste ste ste Sto str str stu sub sub suc sun sup sup sup sup sur swe syn syn tad Tau tel ten ter tet the the the thi Tho thr tid tim Tit top tot tra tra tra tra tre tri Tro tru tur TW Typ U G ult unb und uni uni uns ura use val vap vec Vel Ven Ver Vie Vir vir vis vol W V war wav wav wea Wei Wez wid win WN3 Wol Wro Y d YOR zen zir > >>