Source : Webster's Revised Unabridged Dictionary (1913)

Whilk \Whilk\, n. [See {Whelk} a mollusk.]
   1. (Zo["o]l.) A kind of mollusk, a whelk. [Prov. Eng.]

   2. (Zo["o]l.) The scoter. [Prov. Eng.]

Whilk \Whilk\, pron.
   Which. [Obs. or Scot.]

   Note: Whilk is sometimes used in Chaucer to represent the
         Northern dialect.