[coo.per] n [ME couper, cowper, fr. MD cuper (fr. cupe cask) or MLG kuper, fr. kupe cask; MD cupe & MLG kupe, fr. L cupa; akin to Gk kypellon cup--more at hive] (14c): one that makes or repairs wooden casks or tubs
[2]cooper vb coo.pered ; coo.per.ing vt (1742): to work as a cooper on ~ vi: to work at or do coopering