Webster's English Dictionary

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ass

ass \'as\ n [ME, fr. OE assa, perh. fr. OIr asan, fr. L asinus] 1: any of 
   several hardy gregarious mammals (genus Equus) that are smaller than the 
   horse, have long ears, and include one domesticated form (E. asinus) used 
   as a beast of burden 2: a stupid, obstinate, or perverse person