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: 425
flow line
  خط ِ تچان   
xatt-e tacân

Fr.: ligne d'écoulement   

Same as → streamline.

flow; → line.

flow rate
  نرخ ِ تچان   
nerx-e tacân

Fr.: débit   

The amount of a substance, specifically a → fluid, moving across a specified unit → area in a given amount of → time.

flow; → rate.

flow tube
  لوله‌ی ِ تچان   
lule-ye tacân

Fr.: tube d'écoulement   

Same as → stream tube.

flow; → tube.

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
  انگیزتابی   
angiztâbi

Fr.: fluorescence   

Process 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. → phosphorescence.

Coined by E. mathematician and physicist Sir George G. Stokes (1819-1903) from fluor- (from fluorspar "a mineral composed of calcium fluoride, CaF2, also called fluorite, that is often fluorescent under ultraviolet light") + -escence a suffix of nouns denoting action or process, change, state or condition, etc.

Angiztâbi, from angiz present stem of angixtanexcite + tâb "light; heat, warmth; illuminating," from tâbidan, tâftan "to shine," tafsidan "to become hot" (Av. tāp-, taf- "to warm up, heat," tafsat "became hot," tāpaiieiti "to create warmth;" cf. Skt. tap- "to spoil, injure, damage; to suffer; to heat, be/become hot," tapati "burns;" L. tepere "to be warm," tepidus "warm;" PIE base *tep- "warm") + -i noun suffix.

fluorescent lamp
  لامپ ِ انگیزتاب   
lâmp-e angiz-tâb

Fr.: ampoule fluorescente   

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

Fluorescent adj. of → fluorescence; → lamp.

fluoride
  فلویءورید   
fluorid

Fr.: fluorure   

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

fluorine; → -id.

fluorine
  فلویءور   
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 river) with a great noise; to pour," âbšâr "waterfall;" Ossetic ægzælyn "to pour down;" Av. γžār- "to flow;" cf. Skt. ksar- "to flow;" Gk. phtheirein "to destroy, perish."

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