From Fr., from Gk. elastos "ductile, flexible," related to elaunein "to strike, beat out."
Kešâyand, from keš stem of kešidan/kašidan "to pull, drag, draw" (Av. karš- "to draw, to plough," karša- "furrow;" cf. Skt. kars-, kársati "to pull, drag, plough," Gk. pelo, pelomai "to be busy, to bustle") + âyand agent form of âmadan "to come; to become," from Mid.Pers. âmatan (O.Pers. gam- "to come; to go," Av. gam- "to come; to go," jamaiti "goes;" O.Iranian *āgmatani; Skt. gamati "goes;" Gk. bainein "to go, walk, step;" L. venire "to come;" Tocharian A käm- "to come;" O.H.G. queman "to come;" E. come; PIE root *gwem- "to go, come").
Fr.: collision élastique
A collision between two particles which conserves the total kinetic energy and momentum of the system.
Fr.: déformation élastique
Fr.: limite d'élasticité, ~ élastique
Fr.: diffusion élastique
In a → collision between two → particles,
the reaction in which the total → kinetic energy
of the system, projectile plus target, is the same before the collision as after.
mowj-e kešâyand (#)
Fr.: onde élatique
A wave that propagates by → elastic deformation of the medium. The → propagation takes place by a change in shape that disappears when the forces are removed. In other words, the displaced particles transfer momentum to adjoining particles, and are themselves restored to their original position. A → seismic wave is a type of elastic wave.
The ability of a body which has been → deformed by an applied → force to return to its original shape when the force is removed. Up to a certain point the material obeys → Hooke's law. See also → ductility, → plasticity.
Fermat's last theorem
vâpasin farbin-e Fermat
Fr.: dernier théorème de Fermat
In → number theory, the statement that for all → integers, the equation xn + yn = zn has no solution in → positive integer. After 358 years of effort by mathematicians to prove the theorem, a complete proof was found by Andrew Wiles in 1995.
A process used for covering an object with a thin layer of metal by electrochemical means.
→ galvano- + -plasty a suffix meaning "molding, formation, surgical repair, plastic surgery," from Gk. -plastia, from plastos "molded, formed," from plassein "to mold."
Gâlvânopuši, from gâlvâno-, → galvano-, + puši "covering, coating," from pušidan "to cover; to put on" (Mid.Pers. pôšidan, pôš- "to cover; to wear;" cf. Mid.Pers. pôst; Mod.Pers. pust "skin, hide;" O.Pers. pavastā- "thin clay envelope used to protect unbaked clay tablets;" Skt. pavásta- "cover," Proto-Indo-Iranian *pauastā- "cloth").
Fr.: collision inélastique
A collision between bodies in which there is a loss of total kinetic energy.
Fr.: diffusion inélastique
Last, from O.E. latost (adj.) and lætest (adv.), superlative of læt (adj.) and late (adv.); cognate with O.Fris. lest, Du. laatst, O.H.G. laggost, Ger. letzt.
Vâpasin, from vâ-, as intensive prefix, → de-, + pasin, from pas "after, afterward, behind; finally, at last" (Mid.Pers. pas "behind, before, after;" O.Pers. pasā "after;" Av. pasca "behind (of space); then, afterward (of time);" cf. Skt. pazca "behind, after, later;" L. post "behind, in the rear; after, afterward;" O.C.S. po "behind, after;" Lith. pas "at, by;" PIE base *pos-, *posko-) + -in superlative suffix.
Fr.: dernier contact
Same as → fourth contact at an eclipse.
Fr.: dernier quartier
One of the phases of the Moon that appears when it is 90 degrees west of the Sun. Approximately one week after a full moon, when half of the Moon's disk is illuminated by the Sun. → first quarter.
Fr.: dernière diffusion
The epoch in the early evolution of the Universe when matter and photons decoupled. Once atoms formed, light and matter stopped constantly interacting with one another, and photons were able to travel freely. As a result, the Universe became transparent. Light from this period is observed today as the → cosmic microwave background radiation. Same as → decoupling era and → recombination era.
last scattering surface
ruye-ye vâpasin parâkaneš
Fr.: surface de dernière diffusion
The set of locations in space corresponding to the → last scattering epoch in the early Universe. It is a spherical surface around the present-day observer from which the → cosmic microwave background radiation appears to emanate.
Fr.: dernier né
Last in order of birth; youngest.
From L. plasticus, from Gk. plastikos "that may be molded, pertaining to molding," from plassein "to mold."
Šukâyand, literally "moldable," from šuk, contraction of šuka (Dehxodâ) "a mold in which ingots are cast" + âyand agent noun form of âmadan "to come; to become," → elastic.
Fr.: déformation plastique
Fr.: substance plastique