\Rou*lette"\, n.
A small toothed wheel used to make short incisions in paper,
as a sheet of postage stamps to facilitate their separation.

\Rou*lette"\, v. t.
To make short incisions in with a roulette; to separate by
incisions made with a roulette; as, to roulette a sheet of
postage stamps.

\Rou*lette"\, n. [F., 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. (Fine Arts)
   (a) A small toothed wheel used by engravers to roll over a
       plate in order to order to produce rows of dots.
   (b) A similar wheel used to roughen the surface of a
       plate, as in making alterations in a mezzotint.

3. (Geom.) 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}.