Alternative form of archpirate

(anatomy) The costal arch; anterior and lateral boundary between the abdomen and the thorax.

A bridge with abutments at each end shaped as an arch.

(architecture) An arch whose intrados, though apparently straight, has a slightly concave curve upward.

plural of arch bridge

A form of arch in which the intrados is straight, but with its joints drawn radially.

An arch of the thickness of one brick.

An arch of unusual form, following the curve of an ogee.

(religion) A leader of a heresy, a most prominent or leading heretic.

The smokebox of a locomotive.