A very hard, brittle metal belonging to the → platinum group elements; symbol Os. → Atomic number 76, → atomic weight 190.2, → melting point 3,045 °C, → boiling point 5,027 °C, → specific gravity 22.57 at 20°C. It was discovered in 1803 simultaneously with → iridium in a crude → platinum ore by the English chemist Smithson Tennant.
From Gk. osme "smell" because of the sharp odor of the volatile oxide.
The process by which solvent molecules pass through a partially permeable membrane from a dilute solution into a more concentrated solution, thus equalizing the concentrations of materials on either side of the membrane. → permeability.
Extracted from Fr. endosmose "endosmosis" and exosmose "exosmosis," from Gk. prefixed osmos "a thrusting, a pushing," from othein "to push, to thrust;" cf. Av. vādāiiôit "breaks through, hunts," vadah- "wedge;" Mod.Pers. guvah, gavah "wedge;" Skt. vadh- "to slay, kill," vadha- "killer."
Tarârân, literally "pushing across," from tarâ-, → trans-, + rân present stem of rândan "to push, drive, 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.: pression osmotique
The hydrostatic pressure produced on the surface of a partially permeable membrane by osmosis.
Fr.: critère d'Ostriker-Peebles
An approximate empirical criterion for the stability of a → galactic disk against its collapse to form a bar. The disk is stable if the following relation holds: T/|W| < 0.14, where T is the rotational → kinetic energy and |W| is the absolute value of the gravitational → potential energy. While the → Toomre criterion applies only to small linear perturbations, the Ostriker-Peebles criterion describes global modes.
Ostriker & Peebles, 1973, ApJ 186, 467; → criterion.
Away from, or not in, the normal or usual place, position, state, etc.
O.E. ut; (cf. O.N., O.Fris., Goth. ut, Du. uit, Ger. aus; PIE base *ud- "up, up away" (cf. Pers. os-, as below; Gk. hysteros "the latter;" L. usque "all the way to, without interruption;" O.Ir. ud- "out;" Rus. vy- "out").
Borun, variant birun "out, the outside," from Mid.Pers.
bêron, from bê "outside, out, away,"
variant bêg, as in bêgânag (cf. Sogh. bêk "out, outside, apart, except,"
bêk-dênê "heretic," literally "out of religion")
+ rôn "side, direction;"
Av. ravan- "(course of a) river").
out of phase
The condition of two oscillators that have the same frequency but different phases. Opposed to → in phase.
1) A fairly brief period of unusually strong gas and/or dust production from a
A phase in the → light curve evolution of eruptive objects such as → dwarf novae, → Soft X-ray Transients, and transient → magnetars which follows the characterized sudden increase in their flux (over a factor ~ 1000 over the quiescent level). Outburst decay is slow and lasts months or years.
Fr.: issue, résultat
A final product or end result; consequence; issue (Dictionary.com).
Emergence of a particular rock-body, e.g. a stratium or vein, at the ground surface. Outcrops can be formed naturally or by human action. Stream erosion and highway construction can produce outcrops.
Noun use of crop out, from crop, from M.E., O.E. cropp "bird's craw," also "head or top of a sprout or herb;" → out.
Borunzad, literally "strike out," from borun, birun, → out, + zad, zadan "to strike, beat," from Mid.Pers. zatan, žatan; O.Pers./Av. jan-, gan- "to strike, hit, smite, kill" (jantar- "smiter"); cf. Skt. han- "to strike, beat" (hantar- "smiter, killer"); Gk. theinein "to strike;" L. fendere "to strike, push;" Gmc. *gundjo "war, battle;" PIE *gwhen- "to strike, kill."
Being or located on or toward the outside; external.
→ out + -er suffix of comparative degree of adjectives.
Fr.: noyau externe
The upper zone of the → Earth's core, just below the → mantle, extending from a depth of about 2900 km to 5100 km. It is presumed to be → liquid because it sharply reduces → compressional wave velocities and does not transmit → shear waves. Its density is from 9 to 11 g/cm3. The → temperature ranges from 4400 °C in the outer areas to 6100 °C near the → inner core. Since shear waves do not propagate through a fluid, the Earth's outer core is considered to be liquid because the shear wave velocity is zero. Convection motion within the outer core, along with the rotation of the Earth creates an effect that maintains the Earth's → magnetic field.
outer Lindblad resonance (OLP)
bâzâvâyi-ye Lindblad-e boruni
Fr.: résonance de Lindblad externe
A → Lindblad resonance expressed by: Ωp = Ω + κ/m.
seyyâre-ye biruni (#)
Fr.: planète extérieure
fazâ, borun-fazâ, fazâ-ye biruni
Fr.: espace, espace extra-atmosphérique
The space beyond the Earth's atmosphere.
Fr.: flot, écoulement
The act of flowing out; a fluid that flows out; any outward movement. Opposite of → inflow.
1) General: The slow release of a gas that was trapped, frozen, absorbed or
adsorbed in some material.
1) Power which is given out by any plant or part of such plant, in the form and for the
From → out + put, from M.E. put(t)en "to push, thrust, put;" O.E. *putian.
Fr.: éducation grand public
The act of extending research activities beyond its current or conventional limits to a wide section of the population for educational purposes.
Borun-rasâni, from borun, → out, +
rasâni verbal noun of rasândan "to carry, guide, send," transitive
of rasidan "to reach, arrive," → access.
To obtain under contract with an outside supplier.