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A figure having three angles; a triangle.

The cutting region of the crown of an upper molar, usually the anterior part. That of a lower molar is the Tri"go*nid.

Having three angles, or corners; triangular; as, a trigonal stem, one having tree prominent longitudinal angles.

A smooth triangular area on the inner surface of the bladder, limited by the apertures of the ureters and urethra.

A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia.

Having horns with three angles, like those of some species of goats.

See Trituberculy.

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…

ven parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles.

Same as Trigonal.

A book containing the principles of this science. Arithmetic of sines, trigonometry. -- Political arithmetic, the application of the science of numbers to problems in civil government, political economy, and social science. -- Universal arithmetic, the name given by Sir Isaac Newton to algebra.

which, by the help of the line of numbers, solve, with tolerable exactness, questions in trigonometry, navigation, etc. -- Artificial numbers, logarithms. -- Artificial person (Law). See under Person. -- Artificial sines, tangents, etc., the same as logarithms of the natural, tangents, etc. Hutton.

roduced for the purpose of simplifying or facilitating some operation, as in equations or trigonometrical formulæ. Math. Dict.

the related plant, Trigonella ornithopodioides, is also European.

as an exercise in the application of the rules of any study or branch of science; as, in trigonometry and grammar, the principles and rules are illustrated by examples.

A plant (trigonella Foenum Græcum) cultivated for its strong- smelling seeds, which are "now only used for giving false importance to horse medicine and damaged hay." J. Smith (Pop. Names of Plants, 1881).

A large, venomous serpent (Trigonocephalus lanceolatus) of Brazil and the West Indies. It is allied to the rattlesnake, but has no rattle.

air thermometer, reckoned from its zero of expansion. -- Circular functions. See Inverse trigonometrical functions (below). -- Continuous function, a quantity that has no interruption in the continuity of its real values, as the variable changes between any specified limits. -- Discontinuous function. See under Disc…

Pertaining to, or determined by means of, a goniometer; trigonometric.

The art of measuring angles; trigonometry.