Definition of mitres:
(n) :
A covering for the head, worn on solemn occasions by church dignitaries, which has been made in many forms, mostly recently a tall cap with two points or peaks.
(n) :
The surface forming the bevelled end or edge of a piece where a miter joint is made; also, a joint formed or a junction effected by two beveled ends or edges; a miter joint.
(n) :
A cap or cowl for a chimney or ventilation pipe.
(v) :
To adorn with a mitre.
(v) :
To unite at an angle of 45°.
(n) :
A mitre shell