Webster's English Dictionary

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rump

rump \'r*mp\ n [ME, of Scand origin; akin to Icel rumpr rump; akin to MHG 
   rumph to]rso 1a: the upper rounded part of the hindquarters of a quadruped 
   mammal  1b: BUTTOCKS  1c: the sacral or dorsal part of the posterior end of 
   a bird  2: a cut of beef between the loin and round  3: a small fragment 
   remaining after the separation of the larger part of a  group or an area