Definify.com
Webster 1913 Edition
Roulette
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
.