Roulette
Roulette , noun
[French, properly, a little wheel or ball. See Rouleau, Roll.]
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.
2.
(a) (Fine Arts) A small toothed wheel used by engravers to roll over a plate in order to order to produce rows of dots.
(b)
(Fine Arts) A similar wheel used to roughen the surface of a plate, as in making alterations in a mezzotint.
3.
(Geometry) 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 ∗.
4.
A small toothed wheel used to make short incisions in paper, as a sheet of postage stamps to facilitate their separation.
Roulette , transitive verb
To make short incisions in with a roulette; to separate by incisions made with a roulette; as, to roulette a sheet of postage stamps.