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."
Fr.: nom trivial
Chemistry: A common name for a chemical compound derived from the natural source, or of historic origin, and not according to the systematic nomenclature. For example, the trivial name of sodium chloride is → salt.
The quality or state of being → trivial; something trivial.
zabidan, zab kardan
To make → trivial.
Fr.: astéroïde troyen
A member of the family of asteroids that share → Jupiter's orbit and lie in elongated, curved regions around the two → Lagrangian points 60° ahead and behind of Jupiter. The Lagrangian points L4 and L5 host several thousands of them. Originally, the term Trojan applied only to asteroids sharing Jupiter's orbit; however, planetoidal bodies have been discovered at the Lagrangian points of Mars and Neptune as well, and are also referred to as → Mars Trojans and Neptune Trojans respectively.
M.E.; O.E. Troian, from Trojanus, from Troj(a) "Troy" + -anus; → asteroid.
Sayyârakhâ plural of sayyârak, → asteroid; Troâ-yi adj. of Troâ "Troy."
Either of the two parallels of latitude on Earth at which the Sun appears overhead at the → summer and → winter solstices each year: → Tropic of Cancer, → Tropic of Capricorn . The tropics lie at latitudes 23°26', north and south, an angle defined by the Earth's → axial inclination.
M.E., from L. tropicus, from Gk. tropikos "of or pertaining to a turn or change; of or pertaining to to the turn of the Sun's apparent motion at solstice," from trope "a turning."
Hurgard, literally "Sun's turning," from hur, → Sun, + gard "turning, changing," from gardidan "to turn, to change;" Mid.Pers. vartitan; Av. varət- "to turn, revolve;" Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" L. vertere "to turn;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend."
Tropic of Cancer
Fr.: Tropique du Cancer
A parallel of latitude on the Earth, 23°26' north of the equator, where the Sun is directly overhead on the northern → summer solstice (around the 21st June each year), because the Sun reaches its most northerly declination. Some 3,000 years ago, this occurred when the Sun was in the → Zodiac constellation → Cancer, hence the name. However, → precession has resulted in a shift of the position of the Sun so that it is now in the constellation → Gemini on the summer solstice.
Tropic of Capricorn
Fr.: Tropique du Capricorne
A parallel of latitude on the Earth, 23°26' south of the equator, where the Sun is directly overhead on the southern → summer solstice (around the 21st December each year), because the Sun reaches its most southerly declination. Some 3,000 years ago, this occurred when Sun was in the → Zodiac constellation → Cancer, hence the name. However, → precession has resulted in a shift of the position of the Sun so that it is now in the constellation → Sagittarius on the northern → winter solstice.
Fr.: mois tropique
The average period of the revolution of the Moon about the Earth with respect to the → vernal equinox, a period of 27.321 582 days (27d 7h 43m 4.7s).
Fr.: année tropique
The interval during which the Sun's mean longitude, referred to the mean equinox of date, increases by 360 degrees. Its mean length for the epoch J2000.0 is 365.24217879 real solar days (approximately 365.2422 days). This concept of tropical year, adopted by the International Astronomical Union at its General Assembly in Dublin, September 1955, has often been confounded with the → vernal-equinox year. In fact the mean period between two successive true vernal equinoxes is different from the tropical year. This period, which is equal to 365.24236460 solar days (about 365.2424 days), is the real mean length of the year in the Iranian calendar. The difference between the two year lengths is due to the fact that the Earth's orbital velocity around the Sun is not uniform, since the orbit is an ellipse. At the perihelion of its orbit the Earth is closest to the Sun, and therefore moves faster than average, while at aphelion, when it is farthest away from the Sun, it moves slower. Therefore the interval between two successive vernal equinoxes is not the same as the period between two successive summer solstices. In fact the tropical year does not depend on a specific origin for the annual apparent motion of the Sun. For detailed discussion see: A concise review of the Iranian calendar.
A combining form meaning "turn, change."
From Gk. tropos "turn," trope "a turning," from trepein "to turn;" cognate with Pers. sabok and zab, → trivial.
Gašt "turning," past stem of gaštan, gardidan "to turn, to change" (Mid.Pers. vartitan; Av. varət- "to turn, revolve;" Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" L. vertere "to turn;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend").