mi·ter 
(mītər)
(mītər)n.
1. The liturgical headdress and part of the insignia of a Christian bishop. In the Western church it is a tall pointed hat with peaks in front and back, worn at all solemn functions.
2.
a. A thong for binding the hair, worn by women in ancient Greece.
b. The ceremonial headdress worn by ancient Jewish high priests.
3.
a. A miter joint.
b. The edge of a piece of material that has been beveled preparatory to making a miter joint.
c. A miter square.
v. mi·tered, mi·ter·ing, mi·ters
v.tr.
1. To bestow a miter upon.
2.
a. To make (two pieces or surfaces) join with a miter joint.
b. To bevel the edges of for joining with a miter joint.
v.intr.
To meet in a miter joint.
[Middle English mitre, from Old French, from Medieval Latin, from Latin mitra, headdress of the Jewish high priest, from Greek.]
miter·er n.
miterworn by Dr. John Sentamu, Archbishop of York