Webster's English Dictionary

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roulette

rou.lette \ru:-'let\ n [F, lit., small wheel, fr. OF roelete, dim. of roele 
   small wheel, f]r. LL rotella, dim. of L rota wheel - more at ROLL 1: a 
   gambling game in which players bet on which compartment of a revolving  
   wheel a small ball will come to rest in 2a: any of various toothed wheels 
   or disks (as for producing rows of dots o n engraved plates or for making 
   short consecutive incisions in paper to facilitate subsequent division) 2b: 
   tiny slits in a sheet of stamps made by a roulette  - roulette vt