The Collaborative International Dictionary of English v.0.48:

Drinker \Drink"er\, n.
   One who drinks; as, the effects of tea on the drinker; also,
   one who drinks spirituous liquors to excess; a drunkard.
   [1913 Webster]

   Drinker moth (Zool.), a large British moth (Odonestis
      potatoria).
      [1913 Webster]