ˈrāsə(r) noun
( -s )
Etymology: race (II) + -er
1. : one that races : something designed or adapted chiefly or solely for speed or used for racing
2. : racing crab
3. : any of various snakes of the genera Coluber and Mastigophis: as
a. : black racer
b. : blue racer
4. : a poor, thin, or spent fish
5. : a fast running part in a machine
6.
a. : traverse circle
b. : a turntable to which the chassis of a coast artillery gun is secured and used in traversing the gun
7. : racing skate