1. A game of chance, in which a small ball is made to move round rapidly on a circle divided off into numbered red and black spaces, the one on which it stops indicating the result of a variety of wagers permitted by the game. Gambling related Online Roulette.
2. A small toothed wheel used by engravers to roll over a plate in order to order to produce rows of dots. A similar wheel used to roughen the surface of a plate, as in making alterations in a mezzotint.
Origin: F, properly, a little wheel or ball. See Rouleau, Roll.