Definition of whim

• n. - The European widgeon.
• n. - A sudden turn or start of the mind; a temporary eccentricity; a freak; a fancy; a capricious notion; a humor; a caprice.
• n. - 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.
• v. i. - To be subject to, or indulge in, whims; to be whimsical, giddy, or freakish.