Quirk /(kwẽrk)/

Quirk

n.
  1. 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.
    We ground the justification of our nonconformity on dark subtilties and intricate quirks.
  2. A fit or turn; a short paroxysm; a caprice. [Obs.]
  3. A smart retort; a quibble; a shallow conceit.
    Some odd quirks and remnants of wit.
  4. An irregular air; as, light quirks of music.
  5. A piece of ground taken out of any regular ground plot or floor, so as to make a court, yard, etc.; -- sometimes written quink. (Building)
  6. A small channel, deeply recessed in proportion to its width, used to insulate and give relief to a convex rounded molding. (Arch.)

Phrases & Compounds
Quirk molding
a bead between two quirks.