| one minus the cosine of a given angle or arc. Abbreviation: vers. |
| versed sine n. Abbr. vers A trigonometric function of an angle equal to one minus the cosine of that angle. Also called versine. [Translation of New Latin sinus versus : sinus, sine + Latin versus, past participle of vertere, to turn.] |
ver·sine (vûr'sīn') n. See versed sine. [Contraction of versed sine.] |