Fr.: variété plate
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.
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.
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.
11 Taste, especially the distinctive taste of something as it is experienced in the mouth.
A particular quality noticeable in a thing (Dictionary.com).
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."
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).
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, 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
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").
laf, seyl (#)
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, lé 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.
1) That part of a room, hallway, or the like, that forms its lower enclosing surface and
upon which one walks.
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."
Fr.: famille Flora
1) The act or state of remaining on the surface of a liquid.
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).
1) tacân; 2) tacidan
Fr.: 1) flot, écoulement; 2) couler, s'écouler
1) (n.) moving along in a stream; going as in a stream.
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."
Fr.: ligne d'écoulement
Same as → streamline.
Fr.: tube d'écoulement
Same as → stream tube.
Fr.: aptitude à s'écouler, coulabilité
The ability of a body of matter (liquid, gas, loose particulate solid) to flow.
Tacandegi, from tacandé (originally tacandag), agent noun of tacidan, → flow, + noun suffix -i.
oftâxizidan, oftâxiz kardan (#)
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.
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").