General: To regulate by or adjust to a certain measure or proportion; tone down. Physics: To alter the value of some parameter characterizing a periodic oscillation. → modulation.
From L. modulatus pr.p. of modulari "to regulate, measure off properly," from modulus "small measure," diminutive of modus "measure, manner," → mode.
Degarâhangidan, from degar "other, another," denoting change, variant digar (Mid.Pers. dit, ditikar "the other, the second;" O.Pers. duvitiya- "second," Av. daibitya-, bitya- "second;" Skt. dvitiya- "second," PIE *duitiio- "second") + âhang "melody, pitch, tune, modulation" (ultimately from Proto-Iranian *āhang-, from prefix ā- + *hang-, from PIE base *sengwh- "to sing, make an incantation;" cf. O.H.G. singan; Ger. singen; Goth. siggwan; Swed. sjunga; O.E. singan "to chant, sing, tell in song;" maybe cognate with Gk. omphe "voice; oracle") + -idan infinitive suffix.
mowj-e degarâhangidé (#)
Fr.: onde modulée
A combination of two or more waves resulting in the production of
frequencies not present in the original waves, the new frequencies being
usually the sums and differences of integral multiples of the frequencies
in the original waves.
From L. ob- "toward" + latus, abstracted from its opposite, prolatus "lengthened."
Pax "oblate," of unknown etymology.
Fr.: sphéroïde aplati
An ellipsoid produced by rotating an ellipse through 360° about its minor axis. Compare with → prolate spheroid.
The property possessed by a round body that is flattened at the poles.
Noun from → oblate.
Fr.: aplatissement optique
(polar flattening) The ratio of the difference between equatorial and polar diameters to the equatorial diameter. A sphere has an oblateness of 0; an infinitely thin disk has an oblateness of 1 (Ellis et al., 2007, Planetary Ring Systems, Springer).
To have, produce, or generate oscillations. → vibrate.
From L. oscillatus, p.p. of oscillare "to swing," from oscill(um) "swing" + -ate a suffix forming verbs from L. words.
Navidan "to swing, oscillate," from nâvidan, literally "to swing like a ship," from nâv "ship;" O.Pers./Av. *nāv-, O.Pers. nāviyā- "fleet;" Skt. nau-, nava- "ship, boat;" Gk. naus "ship;" PIE *nau- "boat."
Geometry: Of a curve, to touch another curve so as to have the same tangent and curvature at the point of contact.
From L. osculatum p.p. of osculari "to kiss," from osculum "kiss," literally "little mouth," diminutive of os "mouth;" PIE *os-/*ous- "mouth;" cf. Av. āh- "mouth;" Skt. ās-, āsán- "mouth;" Hittite aiš- "mouth;" O.Ir. á "mouth;" O.N. oss "mouth."
Âbusidan, from â- a nuance prefix + busidan "to kiss," related to buyidan "to smell," buy "smell, scent;" Mid.Pers. bôy, bôd "smell, scent; consciousness," bôyidan "to smell," Mod./Mid.Pers. bustân "garden," Parthian (prefixed *pati-) pdbws- "to desire; to hope for;" Av. baod- "to perceive, notice, become aware of; to smell of," baoδi- "smell, fragrance," baozdri- "who gets to know sexually;" cf. Skt. bodh- "to wake, awaken; to perceive, pay attention," Buddha "awakened, enlightened;" Gk. peuthomai "to learn, hear;" Lith. budeti "to wake;" O.C.S. bljusti "to take care;" PIE base *bheudh- "to be aware, to make aware."
Fr.: particule en suspension
From Mod. L. particulatus, from particula, → particle.
From pârul, → particle, + suffix -é or -mand.
particulate matter (PM)
Fr.: particule en suspension
Fr.: postulat de Planck
The postulate that the energy of oscillators in a blackbody is quantized by E = nhν, where n = 1, 2, 3, ..., h is Planck's constant, and ν the frequency.
Fr.: lame plan-parallèle
A piece of glass with plane parallel surfaces used to admit light into an optical system and to exclude dirt and moisture.
1) tiqé (#); 2); 3) pelâk (#)
Fr.: 1) lame; 2); 3) plaque
1) Optics: Any crystalline material whose length is much less than its measured diameter.
→ half-wave plate.
M.E., from O.Fr. plate "thin piece of metal," from M.L. plata "plate, piece of metal," perhaps via V.L. *plattus, from Gk. platys " flat, broad."
1) Tiqé, from
tiq "blade," related to tiz "sharp," variants
tig, tež, tej, tij;
Mid.Pers. tigr, têz, têž "sharp," O.Pers. tigra- "pointed,"
tigra.xauda- "pointed helmet (epithet of Scythians),"
Av. tiγra- "pointed,"
tiγray- "arrow," tiži.arštay- "with the pointed spear,"
cf. Skt. tikta- "sharp, pungent, bitter," tejas- "sharpness, edge,
point or top of a flame;" PIE base *st(e)ig- "to stick; pointed." Cognates in
other IE languages: Gk. stizein "to prick, puncture," stigma
"mark made by a pointed instrument," L. in-stigare "to goad,"
O.H.G. stehhan, Ger. stechen "to stab, prick," Du. stecken,
O.E. sticca "rod, twig, spoon," E. stick.
Fr.: centre de plaque
The celestial coordinates of the center of the field of an astronomical photographic plate.
Fr.: échelle de plaque
The scale factor for converting linear measure on a photographic plate to angular measurement on the sky.
Fr.: tectonique des plaques
The theory supported by a wide range of evidence in which the Earth's crust is composed of several large, thin, relatively rigid plates that move relative to one another. The interaction of the plates at their boundaries causes seismic and tectonic activity along these boundaries. See also → continental drift.
1) An extensive area with a fairly level surface raised sharply above adjacent land.
From Fr. plateau, from O.Fr. platel "flat piece of metal, wood, etc.," diminutive of plat "flat surface or thing," → plate.
Taxtâl, from taxt "flat;" Mid.Pers. taxtag "tablet, plank, (chess)board" + -âl, → -al.
1) A small platelike body.
1) To inhabit; live in; be the inhabitants of.
Infinitive, corresponding to → population.
1) farâvas; 2) farâvasidan
Fr.: 1) postulat; 2) postuler
1) Math.: An unproved assumption taken as basic in a mathematical system, and from which
(in combination with other postulates) the propositions of the system are derived, or in
terms of which the propositions are proved. In modern usage, postulate is synonymous with
From L. postulatum "petition, thing requested," noun use of neuter of p.p. of postulare "to ask, request, demand," akin to poscere "to request."
Farâvas (on the model of piš-nahâd "proposition," and farâ-nemudan "to exhibit, expose"), from farâ-, → pro-, + vas. The second component from Av. vas- "to will, desire, wish, long for," vasəmi "I wish," vasna- "will, favor," ušti- "desire, wish, will," vasô, vasə "at one's will." This word is extant in several Mod.Pers. dialects, Tabari vessen "to wish, desire," Gilaki vâssan "to wish, desire," vâsti "desire," Kurd. wistin "to desire, wish," Lâri avessa "to desire," colloquial Tehrâni vâsé "for" (Mid.Pers. vasnâd "because"); O.Pers. vasiy "at will, greatly, utterly," vašna- "will, favor;" cf. Skt. vaś- "to wish, want, desire," váśa- "wish, desire," vasēna "for, because;" Gk. ekon "voluntary;" PIE base *uek- "to wish."