Whim

The European widgeon.

A sudden turn or start of the mind; a temporary eccentricity; a freak; a fancy; a capricious notion; a humor; a caprice.

A large capstan or vertical drum turned by horse power or steam power, for raising ore or water, etc., from mines, or for other purposes; -- called also whim gin, and whimsey.

To be subject to, or indulge in, whims; to be whimsical, giddy, or freakish.

an odd or fanciful or capricious idea; "the theatrical notion of disguise is associated with disaster in his stories"; "he had a whimsy about flying to the moon"; "whimsy can be humorous to someone with time to enjoy it"

a sudden desire; "he bought it on an impulse"