Webster's English Dictionary

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cooper

1. coo.per \'ku:-p*r, 'ku.p-*r\ n [ME couper, cowper, fr. MD cu-per (fr. 
   cu-pe cask]) of MLG ku-per, fr. ku-pe cask; MD cu-pe & MLG ku-pe, fr. L 
   cupa; akin to Gk kypellon cup - more at hive : one that makes or repairs 
   wooden casks or tubs 
2. cooper \'ku:-p(*-)rin, 'ku.p-(*-)rin\ vb or coo.per.ing : to work as a 
   cooper on  : to work at or do coopering