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According to the rules or principles of trigonometry. Asiat. Res.

TRIG-ON-OM'E-TRY, n. [Gr. τριγωνος, a triangle, and μετρεω, to measure.]

The measuring of triangles; the science of determining the sides and angles of triangles, by ineans of certain parts which are given. When this science is applied to the solution of plane triangles, it is called plane trigonometry; when its application is to spherical triangles, it is called spherical trigonometry.


Containing three sets of characters or letters. Gliddon.

TRI-GRAM'MIC, a. [Gr. τρεις, three, and γραμμα, a letter.]

Consisting of three letters.

TRI'GYN, n. [Gr. τρεις, three, and γυνη, a female.]

In botany, a plant having three styles.


Having three styles.

TRI-HE'DRAL, a. [See Trihedron.]

Having three equal sides.

TRI-HE'DRON, n. [Gr. τρεις, three, and εδρα, side.]

A figure having three equal sides.

TRIJ'U-GOUS, a. [L. tres, three, and jugum, yoke.]

In botany, having three pairs of leaflets. A trijugous leaf is a pinnate leaf with three pairs of leaflets. Martyn.

TRI-LAT'ER-AL, a. [Fr. from L. tres, three, and latus, side.]

Having three sides.


With three sides.

TRI-LIN'GUAL, a. [L. tres and lingua.]

Consisting of three languages.

TRI-LIT'ER-AL, a. [L. tres, three, and litera, letter.]

Consisting of three letters; as, a triliteral root or word.


A word consisting of three letters.

TRIL'I-THON, n. [Gr. τρεις, three, and λιθος, a stone.]

Three stones placed together like door posts and a lintel.

TRILL, n. [It. trillo; Dan. trille; G. triller; W. treilliaw, to turn, to roll. But the latter may be contracted from treiglaw, to turn; traill, traigyl, a turn or roll, from the root of draw, drag. Trill coincides with thirl and drill; D. drillen. Qu. reel.]

A quaver; a shake of the voice in singing, or of the sound of an instrument. [See Shake.]

TRILL, v.i.

  1. To flow in a small stream, or in drops rapidly succeding each other; to trickle. And now and then an ample tear trill'd down / Her delicate cheek. Shak.
  2. To shake or quaver; to play in tremulous vibrations of sound. To judge of trilling notes and tripping feet. Dryden.

TRILL, v.t. [It. trillare.]

To utter with a quavering or tremulousness of voice; to shake. The sober-suited songstress trills her lay. Thomson.


Shaken; uttered with rapid vibrations.


Uttering with a quavering or shake.

TRILL-ION, n. [tril'yun; a word formed arbitrarily of three, or Gr. τριτος, and million.]

The product of a million involved to the third power, or the product of a million multiplied by a million, and that product multiplied by a million; the product of the square of a million multiplied by a million. Thus 1,000,000 X 1,000,000 = 1,000,000,000,000, and this product multiplied by a million = l,000,000,000,000,000,000.

TRI'LO-BATE, a. [L. tres and lobus.]

Having three lobes. Journ. of Science.

TRI'LO-BITE, n. [Gr. τρεις, three, and λοβος, a lobe.]

An extinct family of crustacea, found in the earliest fossiliferous strata.

TRI-LOC'U-LAR, a. [L. tres, and locus, a cell.]

ln botany, three-celled; having three cells for seeds; as, a trilocular capsule.

TRIL'O-GY, n. [Gr. τρεις and λογος.]

A discourse in three parts. Ash.