Webster's English Dictionary

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roller

1. roll.er \'ro--l*r\ n 1a: a revolving cylinder over or on which something 
   is moved or which is us ed to press, shape, or smooth something 1b: a rod 
   on which something (as a shade) is rolled up  2a: a long heavy wave on a 
   coast  2b: a tumbler pigeon 
2. rol.ler \'ro--l*r\ n [G, fr. rollen to roll, reverberate, fr. MF roller, 
   fr. (assumed) V]L rotulare, fr. L rotula 1: any of numerous mostly brightly 
   colored nonpasserine Old World birds (fa mily Coraciidae) related to the 
   motmots and todies 2: a canary having a song in which the notes are soft 
   and run together