An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 431
  لف، سیل   
laf, seyl (#)

Fr.: inondation   

The overflowing of the normal confines of a stream or other body of water, or the accumulation of water over areas that are not normally submerged.

O.E. flod "a flowing of water, river, sea," from P.Gmc. *flothuz (cf. M.Du. vloet, Ger. Flut), from PIE *plo-/*pleu- "flow, float" (cf. Gk. ploein "to float, swim").

Laf "flood," from Lori, Kordi, Malâyeri, in Tabari, variants lur, lây "flood" [Mo'in, Dehxodâ]; cf. Gk. louein "to wash;" L. luere "to wash;" Bret. laouer "trough;" PIE *lou- "to wash." Seyl from Ar.

kaf (#)

Fr.: sol   

1) That part of a room, hallway, or the like, that forms its lower enclosing surface and upon which one walks.
2) A level, supporting surface in any structure (

M.E. flor, from O.E. flor (cf. M.Du. vloer, M.H.G. vluor, Ger. Flur "field, meadow"), from PIE *plaros, from *pele- "flat; to spread."

Kaf "floor; plain ground."

Flora family
  خانواده‌ی ِ فلورا   
xânevâde-ye Flora

Fr.: famille Flora   

An → asteroid family that includes → Gaspra. The group has about 819 members and orbits between 2.17 and 2.33 → astronomical units from the Sun.

Flora; → family.

šenâvari (#)

Fr.: flottation   

1) The act or state of remaining on the surface of a liquid. → buoyancy.
2) The process of separating different materials, especially minerals, by agitating a pulverized mixture of the materials with water, oil, and chemicals based on their tendency to sink in, or float on.

From float, from M.E. floten,  O.E. flotian (cf. O.N. flota, M.Du. vloten), akin to fleet + -ation.

Šenâvari "flotation," from šenâvar "that swims, floats," from šenâ "swimming;" Mid.Pers. šnâz "swim," šnâzidan "to swim;" Av. snā- "to wash, swim;" cf. Skt. snā- "to bathe, to wash;" L. nare, natare "to swim" (Fr. nage, nager, natation; Sp.nadar, natacion).

  ۱) تچان؛ ۲) تچیدن   
1) tacân; 2) tacidan

Fr.: 1) flot, écoulement; 2) couler, s'écouler   

1a) Moving along in a → stream; going as in a stream.
1b) A → dynamical system that evolves continuously with time.
1c) The transference of energy.
2) The corresponding verb.

O.E. flowan, from P.Gmc. *flo- (cf. Du. vloeien "to flow," O.H.G. flouwen "to rinse, wash"), probably from PIE *pleu- "to flow, float" (cf. Skt. plavate "navigates, swims," plavayati "overflows;" Gk. plyno "I wash," pleo "swim, go by sea;" L. pluere "to rain;" Arm. helum "I pour;" Lith. pilu "to pour out").

1) Tacân, from tac- variant tâz- present stem of tacidan, tâxtan, tâzidan "to run; to hasten; to assault," + noun and adj. suffix -ân. Related to the first component are Mod.Pers. tajan name of a river (initially "flowing, streaming, stream"), tâzi "swift (greyhound)," tak "running, rush," from Mid.Pers. tâz-, tâxtan "to flow, to cause to walk," tc- "to flow, to walk," tag "running, attack," tâzig "swift, fast;" Khotanese ttajs- "to flow, to walk;" Av. tac- "to run, to flow," taciāp- "flowing water," tacinti (3pl.pers.act.) "to flow," tacar- "course," tacan "current, streaming;" cf. Skt. tak- "to rush, to hurry," takti "runs;" O.Ir. tech- "to flow;" Lith. teketi "to walk, to flow;" O.C.S. tešti "to walk, to hurry;" Tokharian B cake "river;" PIE base *tekw- "to run; to flow."
2) Verbal form.

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.


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.

  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.

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").

kork (#)

Fr.: duvet   

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

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.

  کرکوار، کرکی   
korkvâr, korki

Fr.: duveteux, bouffant   

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

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.

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.


Fr.: fluidité   

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

fluid + → -ity.


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.


Fr.: fluorescent   

Possessing the property of → fluorescence.

fluorescence; → -escent.

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