The Collaborative International Dictionary of English v.0.48:

Winger \Wing"er\, n. (Naut.)
   One of the casks stowed in the wings of a vessel's hold,
   being smaller than such as are stowed more amidships.
   --Totten.
   [1913 Webster]

WordNet (r) 3.0 (2006):

winger
    n 1: (sports) player in wing position