**Sine** (?), n. [LL. *sinus* a sine, L. *sinus* bosom, used in translating the Ar. *jaib*, properly, bosom, but probably read by mistake (the consonants being the same) for an original *jiba* sine, from Skr. *jiva* bowstring, chord of an arc, sine.] Trig. (a)

The length of a perpendicular drawn from one extremity of an arc of a circle to the diameter drawn through the other extremity.

(b)

The perpendicular itself. See Sine of angle, below.

Artificial sines, logarithms of the natural sines, or logarithmic sines. -- Curve of sines. See Sinusoid. -- Natural sines, the decimals expressing the values of the sines, the radius being unity. -- Sine of an angle, in a circle whose radius is unity, the sine of the arc that measures the angle; in a right-angled triangle, the side opposite the given angle divided by the hypotenuse. See Trigonometrical function, under Function. -- Versed sine, that part of the diameter between the sine and the arc.

© Webster 1913.

**Si"ne** (?), prep. [L.]

Without.

© Webster 1913.