noun a similar wheel used to roughen the surface of a plate, as in making alterations in a mezzotint.
2. roulette ·noun a small toothed wheel used by engravers to roll over a plate in order to order to produce rows of dots.
3. roulette ·add. ·noun a small toothed wheel used to make short incisions in paper, as a sheet of postage stamps to facilitate their separation.
4. roulette ·add. ·vt to make short incisions in with a roulette; to separate by incisions made with a roulette; as, to roulette a sheet of postage stamps.
5. roulette ·noun the curve traced by any point in the plane of a given curve when the latter rolls, without sliding, over another fixed curve. ·see cycloid, and epycycloid.
6. roulette ·noun 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.