mitre

noun

• 1a tall headdress worn by bishops and senior abbots as a symbol of office, tapering to a point at front and back with a deep cleft between.

• 2 (also mitre joint) a joint made between two pieces of wood or other material at an angle of 90°, such that the line of junction bisects this angle: [as modifier]:a mitre saw
• a diagonal seam between two pieces of fabric that are sewn together at a corner.

• 3 (also mitre shell) a mollusc of warm seas which has a sharply pointed shell with a narrow aperture, supposedly resembling a bishop’s mitre.

  • Family Mitridae, class Gastropoda: Mitra and other genera

verb

• join by means of a mitre joint or seam: turn up a double hem, mitring the corners