TRI 7 



tke articulata. and were annihilated by 

 some ancient revolution of our planet. 

 They take tlieir name from being divided 

 into three lobes, or rather three ranges 

 of parts or lobes, by longitudinal sulci. 

 They are found in various parts of the 

 world. 



TRI'LOCULAR, Lat. trilocularis. Three- 

 celled. 



TRIL'LION, from tri-millioti. The pro- 

 duet formed by multiplying a million 

 twice by itself: the third power of a mil- 

 lion. Thus, 1,000,000 X 1,000,000 X 

 1,000,000= 1,000,000,000,000,000,000. In 

 the French notation, however, the square 

 of 1,000 ,000, or 1,000,000,000,000, is named 

 a trillion. 



TRIL'OGT, from rttif, three, and hoytf, 

 discourse. The plays of JEschylus and 

 Shakspeare's Henry VI., are examples of 

 a trilogy. 



TRIM. The position of the keel of a 

 ship with respect to the horizontal line. 



TRIM'MER. In carpentry, a small beam, 

 into which are framed the ends of seve- 

 ral joists. The two joists, into which the 

 ends of the trimmer are framed, are 

 called trimming joists. 



TRINE, from trinits. Three-fold. A term 

 in astrology, for an aspect of the planets, 

 distant from each other 120, forming the 

 figure of a trigon or triangle. 



TRIXER'VATE, Lat. trinervw. Three- 

 nerved. 



TRIN'GLE, French. A term in architec- 

 ture for a small member, fixed exactly 

 npon every triglyph, under the platband 

 of the architrave., from whence hang the 

 guttae in the Doric order : called also a 

 ringlet or listcl. 



TRINITT. The three persons in the 

 Godhead, comprising Father, Son, and 

 Holy Ghost. 



TRIN'ITT HOUSE. A kind of college, in- 

 corporated by Henry VIII., in 1515, (or 

 the promotion of commerce and naviga- 

 tion, by licensing pilots, ordering and 

 erecting beacons, light-houses, &c. 



TRINO'MIAL, from tres, and nomen, a 

 name. A term in algebra for any expres- 

 sion having three terms, as a+bx ex*. 



TRI'O, ) A vocal composition in 



TERZETTO, j three principal parts, ex- 

 clusive of accompaniment. 



TRIOC'TILE, from tres and octo. A term 

 in astrology for an aspect of two planets, 

 when they are three octants or eighth 

 parts of a circle apart, i.e., 135 degrees. 



TRICE'CIA, from TQU;, three, and [otxte, 

 a house. The name of the third order of 

 plants in the class Polygamia, comprising 

 plants with unisexual and bisexual flowers 

 on three separate plants ; or having flow- 

 ers with statnens only on one, pistils on 

 another, and bisexual flowers on a third. 

 The fig-tree U fan-palm are examples. 



6 TRI 



TRI'OLKT. A stun/a of eight lilies, the 

 first of which is thrice repeated. 



TKIO'.NES. In astronomy, the seven prin- 

 cipalstarsin the constellation Urs;i Major. 



TRIOX'YX. A sub-genus of Testuiio, Lin., 

 comprising the soft-shelled tortoises. See 

 TORTOISE. 



TRIPARTITE, Lat. tripartite. Divided 

 into three parts. 



TRIPBTALOI'DEJ;. The name of the fifth 

 natural order of plants established by 

 Linne, comprising plants having tripeta"- 

 lous flowers. 



TRIPET'ALOCS. Three-petalled: tres and 

 petalits. 



TRIPH'THOXG, from TWS, three, and 

 $0& i yy>!< sound. A coalition of three 

 vowels in one compound sound, or in one 

 syllable, as in adieu. 



TRIPHYL'LOVS, Lat. triphyllus. Three- 

 leaved. 



TRIPIN'NATE, Lat. tripinnatus. Triply 

 pinnate. Applied to a pinnate leaf of 

 which the secondary petioles produce ter- 

 tiary petioles, on which the leaflets are 

 implanted. 



TRIP'LE TIME. In music, is that in 

 which each bar is divided into three 

 measures or equal parts, asthree minims, 

 three crotchets, three quavers, &c. 



TRIP'LE SALTS. In chemistry, these are 

 formed by the combination of an acid 

 with two bases ; e.g., microcosmic salt. 



TRJP'LET. 1. In poetry, three verses 



rhymed together. 2. In mtisic, three 



notes sung or played in the time of two. 



TRIPLICATE RATIO. The ratio which 

 cubes bear to each other. 



TRIP'OLI. Rotten-stone. A mineral of 

 an earthy fracture, and yellowish-grey 

 colour, brought from Tripoli, in Barbary. 

 M. Ehrenberg has shown that it consists 

 almost entirely of the siliceous exuviae of 

 microscopic animals of the genera Cocco- 

 nema, Gonphonema, &c. It is found at 

 Billen, in Bohemia, at Santafiora in Tus- 

 cany, in the Isle of France, &c. 



TRIP'PING. In nautical language, loosen- 

 ing an anchor from the ground. 



TRKIUE'TROUS, Lat. triquetrus. Three- 

 sided. 



TRI'REME, Lat. triremis. An ancient 

 galley with three banks of oars. 



TRISEC'TIOS, Lat. trisectio. Dividing 

 anything into three parts. The trisec- 

 tion of an angle was a problem of great ce- 

 lebrity among ancient geometricians. It 

 cannot be accomplished by plane geome- 

 try, and requires the use of conic sections 

 or some other curve. 



TRISEP'ALUUS, Lat. trisepalus. Having 

 three sepals. 



TRIS'MUS. Lock-jaw, from Tfi*>, to 

 gnash. 



TRISYLLABLE, from tret, three, and syl- 

 labus, syllable. A word of throe syllables. 



