Source : Webster's Revised Unabridged Dictionary (1913)

Whimsey \Whim"sey\, Whimsy \Whimsy\, n.; pl. {Whimseys}or
   {Whimsies}. [See {Whim}.]
   1. A whim; a freak; a capricious notion, a fanciful or odd
      conceit. ``The whimsies of poets and painters.'' --Ray.

            Men's folly, whimsies, and inconstancy. --Swift.

            Mistaking the whimseys of a feverish brain for the
            calm revelation of truth.             --Bancroft.

   2. (Mining) A whim.