- 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. - 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. - 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.
Definition
[ n.]