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Fr.: fonction circulaire, ~ trigonomtérique
A function of an angle, one of six functions (sine, cosine, tangent, cotangent, secant, and cosecant) that represent ratios of sides of right triangles. Also called circular function.
didgašt-e sebarsanji, ~ sebarsanjik
Fr.: parallaxe trigonométrique
The branch of mathematics dealing with the relations of the sides and angles of triangles; also the various algebraic functions of these relations.
A geometrical method in land surveying for the determination of the relative position of points. In contrast to → triangulation, trilateration involves measuring the lengths of the three sides of touching or overlapping triangles and not their angles.
In composition, having three nitro groups (NO2), especially replacing hydrogen. → trinitrotoluene.
From L. tri-, a combining form meaning → three + nitro- a combining form used in the names of chemical compounds in which the nitro group is present.
Fr.: trinitrotoluène (TNT)
A yellow, solid chemical compound, that does not occur naturally in the environment. More specifically, 2,4,6-trinitrotoluene (C6H2(NO2)3CH3), is commonly known as TNT. It is an explosive extensively used in munitions and for demolitions.
Fr.: 1) trinôme; 2) trinomial
1) A → polynomial that consists of three terms.
A compound → vowel sound resulting from the succession of three simple vowels pronounced in a single syllable (as in power, hour, fire).
M.E., from M.L. triplare "to triple," from L. triplus "threefold, triple," from tri-, → three, + -plus "-fold."
Setâyi, from setâ, from sé→ three + tâ "fold, plait, ply; piece, part," Mid.Pers. tâg "piece, part."
triple alpha process
farâravand-e âlfâ-ye setâyi
Fr.: réaction triple alpha
A chain of nuclear fusion reactions by which three helium nuclei (→ alpha particles) are transformed into → carbon. First two nuclei of helium collide, fuse, and form a nucleus of → beryllium: 4He + 4He ↔ 8Be, which is unstable and will decay back into two helium nuclei within a few 10-17 seconds. However, due to sufficiently high density and temperature in the stellar core, during a third collision between beryllium and helium, carbon is formed: 8Be + 4He → 12C + γ. The triple-alpha process is possible owing to the existence of the → Hoyle state. It is the main source of energy production in → red giants and → red supergiants in which the core temperature has reached at least 100 million K. Also called → Salpeter process.
Fr.: conjonction triple
A rare event involving a particularly intricate set of movements of two planets or a planet and a star where they meet each other three times in a short period either in opposition or at the time of inferior conjunction, if an inferior planet is involved. The visible movement of the planet or the planets in the sky is therefore normally prograde at the first conjunction, retrograde at the second conjunction and again prograde at the third conjunction.
noqte-ye segâné (#)
Fr.: point triple
The definite pressure and temperature at which all three phases of a substance coexist in → phase equilibrium. The triple point of water has a pressure of 4.58 mm of Hg and a temperature of 273.16 °K.
Fr.: étoile triple
A group of three stars visually or physically associated with each other. → triple system.
Fr.: système triple
A system of three stars which are physically associated among them.
A group or set of three of one kind.
Setâyé, from setâ, → triple, + -(y)é nuance suffix.
Fr.: état triplet
The electronic state of an atom or molecule which has two unpaired electrons, and therefore whose total spin angular momentum is equal to 1.
An ancient astronomical instrument first described by Ptolemy in the Almagest, used in measuring the → altitude of a celestial body. It consisted of three long arms of wood. The first is perpendicular to the → horizon; the second is connected at the head of the first with an axis. The third had a graduated scale. An object was sighted along one arm and its → zenith distance was read on the graduated scale. It performed the same function as the → quadrant. Also called parallactic rulers, Ptolemy's rulers.
L. neuter of triquetrus "three corned," from tri-→ three + -quetrus "corned."
Unstable heavy → isotope of → hydrogen whose nucleus contains one → proton and two → neutrons. Tritium occurs naturally due to → cosmic rays interacting with atmospheric gases. In the most important reaction for natural tritium production, a fast neutron interacts with atmospheric nitrogen: 14N + n → 12C + 3T. Its → half-life is about 12 years. Tritium was formed in an intermediate step in light element synthesis in → early Universe.
The seventh and the largest of → Neptune's satellites. It has a diameter of 2,700 km and orbits its planet at a mean distance of 354,760 km every 5.877 days. Triton was discovered by William Lassell in 1846 scarcely a month after Neptune was discovered. Triton is colder than any other measured object in the solar system with a surface temperature of -235° C. It has an extremely thin atmosphere. Nitrogen ice particles might form thin clouds a few kilometers above the surface. The atmospheric pressure at Triton's surface is about 15 microbars, 0.000015 times the sea-level surface pressure on Earth. Triton is the only large satellite in the solar system to circle a planet in a → retrograde motion, that is in a direction opposite to the rotation of the planet.
In Gk. mythology, Triton is a god of the sea, the son of Poseidon (Neptune); usually portrayed as having the head and trunk of a man and the tail of a fish.
1) Of very little importance or value; insignificant; commonplace; ordinary.
From M.L. trivialis "found everywhere, commonplace; known by every body," from trivium literally "crossroad, a place where three roads meet," also "the lower division of the seven liberal arts taught in medieval universities, i.e. grammar, rhetoric, and logic," from tri-, → three, + via "road," since it was common in Roman Empire for three roads to meet.
Zab "easy, unbought, gratis; straight," variant zap, related to sabok "light, not heavy; unsteady;" Proto-Iranian *θrap-/tarp- "to be unsteady;" cf. Kurd. terpin "to stumble;" Pashto drabəl "to shake, press down;" Skt. trepa- "hasty;" Gk. trepein "to turn;" L. trepidus "agitated, anxious;" PIE *trep- "to shake, tremble."