arc-

Etymology
From, as they represent an angle or arc. Compare etymology of arch.

Prefix

 * arc-sine (British), arcsine (US)
 * arctan
 * arctan

Usage notes
The use of arc- with hyperbolic functions is sometimes discouraged, as the term implies a circular angle. The forms with (derived from hyperbolic ) are more common anyway due to being shorter.

Synonyms

 * -1
 * -1

Translations

 * Hungarian: arkusz-
 * Portuguese: arco-
 * Turkish: ark-