TRIGONOMETRIC; TRIGONOMETRICAL Trig`o*no*met"ric, Trig`o*no*met"ric*al,Etym: [Cf. F. trigonométrique.]
Defn: Of or pertaining to trigonometry; performed by the rules of trigonometry. —Trig`o*no*met"ric*al*ly, adv. Trigonometrical curve, a curve one of whose coördinates is a trigonometric function of the other. — Trigonometrical function. See under Function. — Trigonometrical lines, lines which are employed in solving the different cases of plane and spherical trigonometry, as sines, tangents, secants, and the like. These lines, or the lengths of them, are trigonometrical functions of the arcs and angles to which they belong. — Trigonometrical survey. See under Survey.
TRIGONOMETRY Trig`o*nom"e*try, n.; pl. -tries. Etym: [Gr. -metry: cf. F. trigonométrie. See Trigon.]
1. That branch of mathematics which treats of the relations of the sides and angles of triangles, which the methods of deducing from certain given parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles.
2. A treatise in this science. Analytical trigonometry, that branch of trigonometry which treats of the relations and properties of the trigonometrical functions. — Plane trigonometry, and Spherical trigonometry, those branches of trigonometry in which its principles are applied to plane triangles and spherical triangles respectively.
TRIGONOUS
Trig"o*nous, a. Etym: [L. trigonus, Gr. Trigon.]
Defn: Same as Trigonal.
TRIGRAM
Tri"gram, n. Etym: [Pref. tri- + -gram.]
Defn: Same as Trigraph.
TRIGRAMMATIC
Tri`gram*mat"ic, a. Etym: [Gr.