\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
j[=i]ba sine, from Skr. j[=i]va 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.

\Si"ne\, prep. [L.]
Without.