quirk

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A peculiarity of behavior; an idiosyncrasy.
• noun An unpredictable or unaccountable act or event; a vagary.
• noun A sudden sharp turn or twist.
• noun Architecture A lengthwise groove on a molding between the convex upper part and the soffit.
• noun Archaic An equivocation; a quibble.

from The Century Dictionary.

• To turn sharply.
• To twist or turn; form into quirks.
• To form or furnish with a quirk or channel.
• To emit the breath forcibly after retaining it in violent exertion.
• To grunt; complain.
• noun A sharp turn or angle; a sudden twist.
• noun Hence An artful turn for evasion or subterfuge; a shift; a quibble: as, the quirks of a pettifogger.
• noun A fit or turn; a short paroxysm.
• noun A smart taunt or retort; a slight conceit or quibble; a quip; a flight of fancy.
• noun Inclination; turn; peculiarity; humor; caprice.
• noun A sudden turn or flourish in a musical air; a fantastic phrase.
• noun In building, a piece taken out of any regular ground-plot or floor, as to make a court or yard, etc.: thus, if the ground-plan were square or oblong, and a piece were taken out of the corner, such piece is called a quirk.
• noun In architecture, an acute angle or recess; a deep indentation; the incision under the abacus.
• noun A pane of glass cut at the sides and top in the form of a rhomb.
• noun In a grooving-plane, a projecting fillet on the sole or side, arranged to serve as a fence or gage for depth or distance.

from the GNU version of the Collaborative International Dictionary of English.

• noun A sudden turn; a starting from the point or line; hence, an artful evasion or subterfuge; a shift; a quibble.
• noun obsolete A fit or turn; a short paroxysm; a caprice.
• noun A smart retort; a quibble; a shallow conceit.
• noun An irregular air.
• noun (Building) A piece of ground taken out of any regular ground plot or floor, so as to make a court, yard, etc.; -- sometimes written quink.
• noun (Arch.) A small channel, deeply recessed in proportion to its width, used to insulate and give relief to a convex rounded molding.
• noun a bead between two quirks.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun an idiosyncrasy; a slight glitch, mannerism; something unusual about the manner or style of something or someone
• noun architecture An acute angle dividing a molding; a groove that runs lengthwise between the upper part of a moulding and a soffit
• noun archaic A quibble, evasion, or subterfuge.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a strange attitude or habit
• verb twist or curve abruptly
• noun a narrow groove beside a beading