in a general sense, denotes a cover for the head, in common use before the introduction of hats. Bonnets are still used in many parts of Scotland.

fortification, a small work consisting of two faces, having only a parapet with two rows of palisadoes, of about 10 or 12 feet distance; it is generally raised before the salient angle of the counterfort, and has a communication with the covered way, by a trench cut through the glacis, and palisadoes on each side.

Bonnet à Pretre, or PriePs Bonnet, in fortification, is an out-work, having at the head three salient angles, Bonnet angles, and two inwards. It differs from the double tenaille only in this, that its sides, instead of being parallel, are like the queue d'arondé, or swallow's tail, that is, narrowing, or drawing close at the gorge, and opening at the head.

the sea-language, denotes an addition to a sail; thus we say, lace on the bonnet, or shake off the bonnet.