1. A covering for the head, in common use before the introduction of hats. The word, as now used, signifies a cover for the head, worn by females, close at the sides, and projecting over the forehead.

2. In fortification, a small work with two faces, having only a parapet, with two rows of palisades about 10 or 12 feet distant. Generally it is raised above the salient angle of the counterscarp, and communicates with the covered way.

Bonnet a pretre, or priest's bonnet, is an outwork, having at the head three salient angles and two inwards.

3. In sea language, an addition to sail, or an additional part laced to the foot of a sail, in small vessels, and in moderate winds.