noun A covering for the head, worn on solemn occasions by church dignitaries, which has been made in many reincarnations, most recently as a tall cap with two points or peaks.
noun The surface forming the bevelled end or edge of a piece where a miter joint is made; also, a joint formed or a junction affected by two bevelled ends or edges; a mitral joint.
noun A 13th-century coin minted in Europe which circulated in Ireland as a debased counterfeit sterling penny, outlawed under Edward I.
noun A cap or cowl for a chimney or ventilation pipe.
noun A gusset in sewing, etc.
noun A square with one triangular quarter missing from the outside.