Roulette, n.

(rōō-lĕt’), n. [Fr., properly a little wheel or ball, from rouler, to roll. See ROLL.]

1. A game of chance, in which a small ball is made to move round rapidly on a circle divided off into red and black spaces, and as it stops on the one or the other, the player wins or loses.
2. A small toothed wheel used by engravers to roll over the surface of a plate to produce dots.