1) delek; 2) delekidan
Fr.: 1) dérive; 2) dériver
1a) General: A driving movement or force; impulse; impetus; pressure.
From M.E. drift, from O.E. drifan "to drive," or from O.N. or M.Du. drift, from P.Gmc. *driftiz, related to *dribanan "to drive."
Delek from Lori, Laki, Hamadâni, Malâyeri "push, shove, drive;" variants Gilaki duko, Tâleši dako, Baluchi dhakkk(a) "push, shove, blow," Choresmian dh- "to hit," Kurd. dân/di- "to beat, hit," Proto-Iranian *daH- "to beat, hit, strike" (Cheung 2007); PIE base *dhen- "to hit, push;" delekidan, verb from delek.
Fr.: courbe de passage
In radio astronomy, the output response as a function of position for a given filter as the source passes through the beam.
Fr.: taux de dérive
The amount of drift, in any of its several senses, per unit time.
Fr.: vitesse de dérive
The average velocity of a charged particle in a plasma in response to an applied electric field.
1) rândan (#); 2) râneš (#), râné (#)
Fr.: 1) entraîner; 2) entraînement
1a) To cause to move, to force to act.
→ continuum-driven wind,
→ dust-driven wind,
→ line-driven wind,
→ radiation-driven implosion,
→ radiation-driven mass loss,
→ radiation-driven wind.
M.E. driven; O.E. drifan; cf. O.N. drifa, Goth. dreiban.
Rândan "to cause to go," causative of raftan "to go, walk, proceed" (present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").
Fr.: précision de guidage
The accuracy with which a telescope is moved by alpha or delta drives.
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.
dogânebâvari, dogânegerâyi, dogânegi
1) Philo.: The doctrine, as opposed to idealism and materialism,
that reality consists of two basic types of substance usually taken to be
mind and matter or two basic types of entity, mental and physical.
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.