Quadrant: A quarter circle shaped piece of metal used to support drop fronts.
Quartered: Method of cutting the log into four quarters through the center, and then into parallel boards in order to produce a grain having a cross section of the rays.
Quatrefoil: Gothic form made from the conventionalized four-leaf clover, the four intersecting curves being enclosed in a circular shape.
Quirk: Narrow groove molding, a sunken fillet or channel.