The Collaborative International Dictionary of English v.0.48:

Cooper \Coop"er\ (?; 277), n. [From Coop.]
   One who makes barrels, hogsheads, casks, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cooper \Coop"er\, v. t. [imp. & p. p. Coopered; p. pr. & vb.
   n. Coopering.]
   To do the work of a cooper upon; as, to cooper a cask or
   barrel.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Cooper
    n 1: United States industrialist who built the first American
         locomotive; founded Cooper Union in New York City to offer
         free courses in the arts and sciences (1791-1883) [syn:
         Cooper, Peter Cooper]
    2: United States film actor noted for his portrayals of strong
       silent heroes (1901-1961) [syn: Cooper, Gary Cooper,
       Frank Cooper]
    3: United States novelist noted for his stories of American
       Indians and the frontier life (1789-1851) [syn: Cooper,
       James Fenimore Cooper]
    4: a craftsman who makes or repairs wooden barrels or tubs [syn:
       cooper, barrel maker]
    v 1: make barrels and casks