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From The Collaborative International Dictionary of English v.0.48:
Whimsey \Whim"sey\, Whimsy \Whimsy\, n.; pl. Whimseysor Whimsies. [See Whim.] [1913 Webster] 1. A whim; a freak; a capricious notion, a fanciful or odd conceit. "The whimsies of poets and painters." --Ray. [1913 Webster] Men's folly, whimsies, and inconstancy. --Swift. [1913 Webster] Mistaking the whimseys of a feverish brain for the calm revelation of truth. --Bancroft. [1913 Webster] 2. (Mining) A whim. [1913 Webster]