An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13048 Search : far
flat manifold
  بسلای ِ تخت   
baslâ-ye taxt

Fr.: variété plate   

A manifold with a → Riemannian metric that has → zero → curvature.

flat; → manifold.

flat rotation curve
  خم ِ چرخش ِ تخت   
xam-e carxeš-e taxt

Fr.: courbe de rotation plate   

A galactic → rotation curve in which the → rotation velocity is constant in the outer parts. The flat component is preceded by a rising curve that shows solid body rotation in the very center of the → galaxy. A flat rotation curve implies that the mass is still increasing linearly with radius. See also → dark matter.

flat; → rotation; → curve.

flat Universe
  گیتی ِ تخت   
giti-ye taxt

Fr.: univers plat   

A Universe where the → geometry is → Euclidean, i.e. parallel lines remain parallel when extended into the distance and the sum of the interior angles of a triangle is 180°. The → space-time in a flat Universe has a null → curvature constant, k = 0. See also → closed Universe, → open Universe.

flat; → universe.

flat-field
  میدان ِ تخت   

Fr.: champ plat   

Exposure of a diffuse and uniform source in order to calibrate the non-uniformity of an imaging detector such as a CCD.

flat; → field.

Meydân, → field; taxt, → flat.

flatness problem
  پراسه‌ی ِ تختی   
parâse-ye yaxti

Fr.: problème de la platitude   

The observed fact that the → geometry of the → Universe is very nearly flat, in other words its density is very close to the → critical density. This would be an extreme coincidence because a → flat Universe is a special case. Many attempts have been made to explain the flatness problem, and modern theories now include the idea of → inflation.

flat; → problem.

flavor
  چاشنی   
câšni (#)

Fr.: saveur   

11 Taste, especially the distinctive taste of something as it is experienced in the mouth. A particular quality noticeable in a thing (Dictionary.com).
2) Any of the six labels given to the distinct kinds of → quark: up, down, strange, charm, bottom, and top.
3) → neutrino flavor.

M.E., from O.Fr. flaor "smell, odor; action of smelling, sense of smell," probably from V.L. flator "odor," literally "that which blows," in L. "blower," from flareQ "to blow, puff," which is cognate with O.E. blawan, → blow.

Câšni "taste; taste by way of a sample; quality," related to cašidan, caš- "to taste," câšt "breakfast," cašté "bait;" Mid.Pers. câšt "meal," câšnig "taste;" cf. Skt. cas- "to eat;" Proto-Ir. caš- "to eat, to drink; to drip."

Fleming's rules
  رزن‌های ِ فلمینگ   
razanhâ-ye Fleming

Fr.: règles de Fleming   

Two rules used to assist in remembering the relative directions of the magnetic field, current, and motion in electrical machines, using one's fingers. The right hand refers to generators, the left hand to motors. The three directions are represented by the thumb (for force or motion), forefinger (for field), and second finger (for current), all held at right angles to each other.

Devised by the British physicist and electrical engineer John Ambrose Fleming (1849-1945).

flex
  چفتیدن، چفتن   
caftidan, caftan

Fr.:   

1) To bend or be bent.
2) Of a material, to be capable of warping or bending and then reverting to shape (OxfordDictionaries.com).

Probably a back-formation from → flexible, from L. flexus, p.p. of flectere "to bend, turn."

Caftidan, caftan "to bend, incline," cafté "curved, bent," of unknown origin.

flexibility
  چفتش‌پذیری   
caftešpaziri

Fr.: flexibilité   

1) The quality of bending easily without breaking.
2) The ability to be easily modified.

flexible; → -ity.

flexible
  چفتش‌پذیر   
caftešpazir

Fr.: flexible   

Capable of being bent easily without breaking.

flex + -ible, variant of → -able.

flexion
  چفتش   
cafteš

Fr.:   

1) The act of bending, the state of being bent.
2) The position that a limb assumes when it is bent.

flex; → -tion.

flexure
  چفتگی   
caftegi

Fr.: flexion   

The action of bending or curving, or the condition of being bent or curved.

flex + suffix -ure.

flight
  پرواز   
parvâz (#)

Fr.: vol   

The act, manner, or power of flying.

O.E. flyht "a flying, flight," from P.Gmc. *flukhtiz (cf. Ger. Flucht).

Parvâz, from Mid.Pers. parwâz; Av. pāirivāza- "overrunning," from pāiri- "over (of space), from" + vāza- from vaz- "to fly, float; to drive;" cf. Skt. vah-, vahati. Also Mid.Pers. vâz "jump, flight," Mod.Pers. Lori, Gilaki, Tabari vâz "jump, leap."

flint glass
  فلینت، شیشه‌ی ِ ~   
flint, šiše-ye ~ (#)

Fr.: flint, flint-glass   

A basic type of optical glass containing lead oxide and a smaller amount of potassium, characterized by its brilliance, clarity, and durability. It has a high → dispersion relative to its → refractive index, as compared to, e.g. → crown glass. Flint glass is sometimes used as the diverging lens component of an → achromatic lens. It is also used in the manufacture of table glassware.

Flint, because it was originally made of calcined flints, from M.E., O.E.; cf. M.Du. vlint, O.H.G. flins, Dan. flint; Gk. plinthos "brick, tile."

flocculent spiral galaxy
  کهکشان ِ مارپیچ ِ پشمین   
kahkešân-e mârpic-e pašmin

Fr.: galaxie spirale floculente   

A galaxy that has short segments of patchy spiral structure so that the disk appears like the fleece of a sheep. Examples: NGC 2841 and NGC 5055.

From L. floccus "flock of wool" + -ulent; → spiral galaxy.

Kahkešân, → galaxy; mârpic, → spiral; pašmin "woolly, woollen," from pašm "wool" (Mid.Pers. pašm "wool;" Av. pašna- "eyelash, eyelid;" cp. Skt. páksman- "eyelashes;" Gk. pekos "wool, fleece," pek(t)ein "to comb, pluck;" Lith. pešti "to pluck;" O.N. fax "mane").

flood
  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.

floor
  کف   
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 (Dictionary.com).

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.

flotation
  شناوری   
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).

flow
  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.

<< < -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 ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit 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 con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima Ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo 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 mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp 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 phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad ran rar ray rea rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>