versed sine

Etymology
From New Latin ; the sine function being sometimes called.

Noun

 * 1)  The trigonometric function 1 &minus; cos(x).

Usage notes
Once considered an important trigonometric function; now much less so, since the advent of calculators and computers.

Translations

 * Finnish: versini
 * German: Versinus, Sinus versus
 * Greek: παρημίτονο
 * Ido:
 * Italian: senoverso
 * Spanish: seno verso