a 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

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

a mitre saw

a mollusc of warm seas which has a sharply pointed shell with a narrow aperture, supposedly resembling a bishop's mitre

join by means of a mitre joint or seam

turn up a double hem, mitring the corners