rou·lette /ruˈlɛt/
 輪盤賭,點線機,轉跡線


 Rou·lette n.
 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.
 4. 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.

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 roulette
      n 1: a line generated by a point on one figure rolling around a
           second figure [syn: line roulette]
      2: a wheel with teeth for making a row of perforations [syn: {toothed
         wheel]
      3: a gambling game in which players bet on which compartment of
         a revolving wheel a small ball will come to rest in