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late thermal pulse tape-ye garmâyi-ye dirân Fr.: flash de l'hélium tardif In evolutionary models of → low-mass and → intermediate-mass stars, the occurrence of a → helium shell flash on the → horizontal branch of the → post-AGB track, while → hydrogen shell burning is still going on. |
late-type galaxy (LTG) kahkešân-e gune-ye farjâmin Fr.: galaxie de type tardif In the → Hubble classification, a galaxy on the left part of the → Hubble sequence. See also → early-type galaxy. |
late-type star setâre-ye gune-ye farjâmin Fr.: étoile de type tardif A star of → spectral type K, M, S, or C, with a surface temperature lower than that of the Sun. → early-type star. See also → spectral classification. |
latent nahân (#) Fr.: latent Present but not visible, apparent, or actualized; existing as potential (Dictionary.com). → latent heat. From L. latentem (nominative latens), pr.p. of latere "to lie hidden." Nahân "concealed, hid; clandestine;" Mid.Pers. nihân "secrecy, a secret place, a hiding place," nihânik "concealed;" Av. niδāti- "deposing, deposit." |
latent heat garmâ-ye nahân (#) Fr.: chaleur latente The amount of → thermal energy that is absorbed or released by a unit amount of a substance in the process of a phase change under conditions of constant pressure and temperature. |
lateral bari, kenâri, pahluyi Fr.: latéral Of or relating to the → side; situated at, proceeding from, or directed to a side (Dictionary.com). M.E., from O.Fr. latéral and directly from L. lateralis "belonging to the side," from latus "the side, flank; lateral surface." Kenâri, relating to kenâr, → side. |
latitude varunâ Fr.: latitude The angle between a perpendicular at a location, and the
→ equatorial plane of the Earth.
→ longitude. See also: L. latitudo "breadth, width, size," from latus "wide," from PIE base *stela- "to spread" (cf. O.C.S. steljo "to spread out," Arm. lain "broad"). Varunâ, from var "breadth, side, breast," variant bar, Tabari vari "width," Mid.Pers. var "breast," Av. varah- "breast" (Sk. vara- "width, breadth") + -u a suffix forming adjectives; Av. vouru- "wide;" + -nâ a suffix of dimension. |
lattice jâré Fr.: réseau 1) A regular geometric arrangement of points in a plane or in space. From O.Fr. latiz "lattice," from late "lath, board, plank, batten" (Fr. latte); cf. O.H.G. latta "lath." Jâré, from jarra "net; snare," Afghan jâli "reticulated garment," Tabari jarazin "grilled apparatus used in a watercourse to gather thatch and trash;" cf. Skt. jāla- "net, snare, lattice." |
lattice energy kâruž-e jâré Fr.: énergie réticulaire The energy required to separate an ion from a → crystal to an infinite distance. In other words, the energy released when one → mole of a crystal is formed from gaseous ions. |
latus rectum târ-e râst Fr.: latus rectum The chord through a focus and perpendicular to then major axis of a conic section. L. latus "side;" rectum "straight," → right. Târ "thread, warp, string" (related to tur "net, fishing net, snare," tâl "thread" (Borujerdi dialect), tân "thread, warp of a web," from tanidan, tan- "to spin, twist, weave;" Mid.Pers. tanitan; Av. tan- to stretch, extend;" cf. Skt. tan- to stretch, extend;" tanoti "stretches," tántra- "warp; essence, main point;" Gk. teinein "to stretch, pull tight;" L. tendere "to stretch;" Lith. tiñklas "net, fishing net, snare," Latv. tikls "net;" PIE base *ten- "to stretch." |
lava godâzé (#) Fr.: lave Molten → magma released from a volcanic vent or fissure. Lava, from It. lava "torrent, stream," from L. lavare "to wash;" PIE base *lou- "to wash;" cf. Persian Lori, Kurdi, Malâyeri laf "flood," variants Tabari lé, [Mo'in, Dehxodâ] lur, lây "flood;" Gk. louein "to wash." |
law qânun (#), arté (#) Fr.: loi 1) A rule of conduct or procedure established by custom, agreement,
or authority. M.E., O.E. lagu, from O.N. *lagu, variant of lag "that which is laid down;" cf. Ger. liegen, E. lay, lie; PIE *legh- "To lie, lay;" compare with Hittite laggari "falls, lies," Gk. lekhesthai "to lie down," L. lectus "bed," O.Ir. lige "bed, tomb," Tokharian lake, leke "bed." Qânun, from Ar., ultimately from Gk. kanon "rule." |
law of cosines qânun-e kosinushâ Fr.: loi des cosinus An expression that for any triangle relates the length of a side to the cosine of the opposite angle and the lengths of the two other sides. If a, b, and c are the sides and A, B, and C are the corresponding opposites angles: a^{2} = b^{2} + c^{2} - 2bc cos A; b^{2} = c^{2} + a^{2} - 2ca cos B; c^{2} = a^{2} + b^{2} - 2ab cos C. |
law of excluded middle qânun-e miyâni soklândé Fr.: principe du milieu exclu Same as → principle of excluded middle. |
law of identity qânun-e idâni Fr.: principe d'identité Same as → principle of identity. |
law of inertia qânun-e laxti (#) Fr.: loi d'inertie Same as → Newton's first law. The → reference frames to which the law applies are called → inertial frames. |
law of non-contradiction qânun-e nâpâdguyi Fr.: principe de non-contradiction Same as → principle of non-contradiction. → law; → non-; → contradiction. |
law of reflection qânun-e bâztâb (#) Fr.: loi de réflexion One of the two laws governing reflection of light from a surface: a) The → incident ray, normal to surface, and reflected ray lie in the same plane. b) The → angle of incidence (with the normal to the surface) is equal to the → angle of reflection. → law; → reflection. |
law of refraction qânun-e šekast (#) Fr.: loi de réfraction One of the two laws governing → refraction of light when it enters another transparent medium: a) The → incident ray, normal to the surface, and refracted ray, all lie in the same plane. b) → Snell's law is satisfied. → law; → refraction. |
law of sines qânun-e sinushâ Fr.: loi des sinus In any triangle the sides are proportional to the sines of the opposite angles: a/sin A = b/sin B = c/sin C, where A, B, and C are the three vertices and a, b, and c are the corresponding sides. |
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