Quirk

Webster's Dictionary

(1):

(n.) A sudden turn; a starting from the point or line; hence, an artful evasion or subterfuge; a shift; a quibble; as, the quirks of a pettifogger.

(2):

(n.) A fit or turn; a short paroxysm; a caprice.

(3):

(n.) A piece of ground taken out of any regular ground plot or floor, so as to make a court, yard, etc.; - sometimes written quink.

(4):

(n.) An irregular air; as, light quirks of music.

(5):

(n.) A smart retort; a quibble; a shallow conceit.

(6):

(n.) A small channel, deeply recessed in proportion to its width, used to insulate and give relief to a convex rounded molding.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

Quirk

is an architectural term for a small acute channel or recess much used in mouldings.