arc-

From Latin arcus (“bow, arc”), as they represent an angle or arc. Compare etymology of arch.

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arc-

1. (mathematics) Used to form the names of inverse trigonometric functions, and the symbols for these functions.

   arc-sine (British), arcsine (US)

   arctan

2. (mathematics, sometimes proscribed) Alternative form of ar- used to form the names of inverse hyperbolic functions, and the symbols for these functions.

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

• a-
• ^-1

• arch- (encompassing a wide assortment)

• CAR, CRA, Car, RAC, RCA, acr-, car, rac-