Definition of: quirk

(kwûrk) noun
1. A short or sharp turn; twist.
2. A quaint turn of the fancy; bright retort; hence, a personal peculiarity; caprice.
3. An artful turn for evasion or subterfuge; quibble.
4. A sudden curve or flourish, especially in drawing or writing.
5. Archit. a A small groove in, beside, or between moldings or beads. b A molding or bead having a groove on one or both edges. See synonyms under WHIM. [Origin uncertain]