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Sine n. 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.