n. 轮盘赌, 点线机, 骑缝线

Roulette \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.
[Webster 1913 Suppl.]


Roulette \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}.

4. A small toothed wheel used to make short incisions in
paper, as a sheet of postage stamps to facilitate their
separation.
[Webster 1913 Suppl.]