Definitions from Wiktionary ( )

▸ noun:  (uncountable) A game of chance in which a small ball is made to move round rapidly on a circle divided off into numbered (usually red and black) spaces. When the ball stops, it indicates the result of a variety of wagers permitted by the game.
▸ noun:  (uncountable, figuratively) An instance of risk-taking, especially when the downside exceeds the upside (contrary to the game of roulette where only the wager is lost).
▸ noun:  (countable) A small toothed wheel used by engravers to roll over a plate in order to produce rows of dots.
▸ noun:  (countable) A similar wheel used to roughen the surface of a plate, as in making alterations in a mezzotint.
▸ noun:  (countable, geometry) The locus of a point on a plane curve that rolls without slipping along another fixed plane curve.
▸ noun:  (philately) Any of the small incisions on a sheet of stamps, used as an alternative to perforations.
▸ noun:  A cylindrical curler for the hair.
▸ verb:  To separate or decorate by incisions made with a small toothed wheel.

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