Sine

n. [Fr. sīnus, It. & Sp. seno, from Lat. sīnus, a bent surface, a curve.] (Trigonometry.) (a.) The length of a perpendicular drawn from one extremity of an arc to the diameter drawn through the other extremity. (b.) The perpendicular itself.

Artificial sines, logarithms of the natural sines, or logarithmic sines. — Natural sines, the decimals expressing the values of the sines, the radius being unity. — Sine of an angle, the sine of the arc which measures the angle. — Versed sine, that part of the diameter between the sine and the arc. Hutton.