narmé bârân (#)
Fr.: bruine, crachin
Very small, numerous, and uniformly distributed water drops that may appear to float while following air currents. Unlike fog droplets, drizzle falls to the ground.
Drizzle, dryseling "a falling of dew," from M.E. drysning, related to dreosan "to fall," cf. O.S. driosan, Goth. driusan.
Narmé bârân literally "smooth rain," from narmé, from narm "soft; smooth; mild," Mid.Pers. narm + bârân, → rain.
1) cekké; 2) cekidan
Fr.: 1) goutte; 2) tomber goutte à goutte
1a) A small quantity of liquid that falls or forms in a round or pear-shaped mass.
M.E. drop(e), from O.E. dropian; related to O.H.G. triofan, Du. drop, Ger. Tropfen.
Cekké, cekidan "drop; small, minute," cekidan "to drop."
A very small drop of a liquid.
→ drop + diminutive suffix let.
Fr.: lumière de Drummond
A very brilliant white light which is the ignited flame of a mixture of oxygen and hydrogen projected against a block of calcium oxide (lime). Also called limelight. First working version produced by Lieutenant of the Royal Engineers, upon the Ordnance Trigonometrical Survey of Ireland (1826). It was used at night as a substitute for solar light. It was first employed in a theater in 1837 and was in wide use by the 1860s, among which in photography.
Named after Scottish engineer Thomas Drummond (1797-1840); → light.
Fr.: sec, aride
1) Lacking moisture; not damp or wet.
M.E. drie; O.E. dryge; cf. M.L.G. dröge, M.Du. druge, Du. droog, O.H.G. trucchon, Ger. trocken.
Xošk "dry;" Mid.Pers. xušk "dry;" O.Pers. uška- "mainland;" Av. huška- "dry;" cf. Skt. śuska- "dry, dried out;" Gk. auos "dry, dried up;" O.E. sēar "dried up, withered;" Lith. sausas "dry, barren."
Fr.: fusion sans gaz
Of, pertaining to, or noting two; having a twofold, or double, character or nature.
From L. dualis, from duo "two."
Dogâné, from do "two," cognate with duo + -gân plurality suffix + -é nuance suffix.
dual supermassive black hole
siyah-câl-e abar-porjerm-e dogâné
Fr.: trou noir supermassif double
The outcome of a → merger process between two galaxies, each with its own central → supermassive black hole (SMBH), resulting in a remnant galaxy hosting two SMBHs. Simulations of → galaxy mergers show there should be lots of dual → active galactic nuclei (AGN) visible at less than 10 kpc separations. As of 2015 more than 100 known dual supermassive black holes have been found. See also → binary supermassive black hole.
The quality or character of being twofold, as the → wave-particle duality.
M.E dualitie, from L.L. dualitas.
Dogânegi, from dogânag + -i.
Dubhe (α Ursae Majoris)
The second brightest star in the constellation → Ursa Major with a → visual magnitude of about 1.8. It lies at the front of the → Big Dipper's bowl and with → Merak (Beta UMa) makes the famous → Pointers. α Ursae Majoris is a → supergiant of type K0 IIIa and has a → companion.
From Ar. al-dubb (
Dobbé from Ar., as above.
Describing a substance that exhibits → ductility.
M.E., from L. ductilis, from duct(us), p.p. of ducere "to draw along," → aonduct, + -ilis "-il," a suffix of adjectives.
Rešâyand, literally "capable of becoming string, thread," from reš, as in rešté "thread, line, rope, row," rešmé "string, rope, thread," variants rasan, ras, (Gilaki) viris, related to abrišam "silk;" from reštan, risidan "to spin;" Mid.Pers. rištag "rope, string, thread;" Av. uruuaēs- "to turn around," uruuaēsa- "vortex in water;" Proto-Iranian *uris- "to turn, spin;" cf. Skt. vréśī- "an appellation of waters;" Gk. rhiknos "crooked;" Lith. rišti "tie, bind;" O.H.G. rīho "knee-bend;" âyand agent noun form of âmadan "to come; to become," → elastic.
Fr.: loi de Dulong et Petit
The product of the → specific heat and → atomic weight of most solid elements at room → temperature is nearly the same. In other words, specific heat is constant for a solid and independent of temperature. Experiment shows that at moderate temperatures this law is satisfied for → crystals with rather simple structure. However, the law fails for crystals with more complex structures. More specifically the law cannot explain the variation of specific heat with temperature. The specific heat drops to zero as the temperature approaches 0 K. This behavior is explained only with the quantum theory. → Debye model.
Named after Pierre L. Dulong (1785-1838) and Alexis T. Petit (1797-1820), French chemists, who proposed the law in 1819. They collaborated in several important investigations, including studies of thermal expansion of gases and of liquids and the specific heats of substances; → law.
Dumbbell Nebula (M27, NGC 6853)
Fr.: Nébuleuse de l'Haltère
One of the brightest planetary nebulae; it lies in the constellation → Vulpecula at a distance of about 1000 light-years. It was discovered by Charles Messier in 1764.
Dumbbell "a short bar with weights at each end that is used for exercise," from dumb + bell. When viewed in a small telescope, the brighter portion of the nebula shows like a bipolar geometry, hence the name; → nebula.
Dambel loanword from dumbbell, as above; → nebula.
Consisting of twelve → years.
duodecennial animal calendar
gâhšomâr-e davâzdahsâli-ye janevari (#)
Fr.: calendrier duodécennal
A → lunisolar calendar in which the years are named after each of the following twelve animals: rat, ox, tiger, hare, dragon, snake, horse, sheep, monkey, cock, dog, pig. An animal presides over one year in the twelve-year cycle, which is then repeated. The calendar was/is mainly used by central Asian cultures (Khotanese, Sogdians, Buddhists, Kucheans, Mongols, and Chinese). It was also used in Iran after the Mongol invasion in the thirteenth century.
1) dotâyidan, dotâ kardan; 2) dotâkard
Fr.: 1) faire un double de; 2) double, copie exacte
1) To make an exact copy of.
Dotâyidan, "to double," infinitive from dotâyi, → double.
An act or instance of duplicating; the state of being duplicated.
Verbal noun of → duplicate.
qobâr(#), gard (#)
Tiny pieces of solid material, such as carbon and silicate grains, in the → interstellar medium that are about 0.1-1.0 micron in size. → Dust grains embedded in → molecular clouds may be significantly larger.
O.E. dust, akin to O.H.G. tunst "storm," from P.Gmc. *dunstaz, from PIE base dhem-/dhemə- "to smoke, to blow," cf. Skt. dhūmá "smoke," Mod.Pers. dam "smoke; to blow, breathe," Av. dāδmainya- "blowing up," Gk. thumiao "to fumigate, burn incense," thymos "spirit, mind, soul," L. fumus "smoke," Ossetic dymyn/dumun "to smoke, blow up," Lith. dumai "smoke."
Qobâr, from Ar.; gard "dust," Mid.Pers. gart, gard.
Fr.: analogue de poussière
A chemical compound produced in laboratory experiments to simulate real → interstellar dust grains and thus study them.