<p><strong>Noun</strong></p><ul><li>A hat, usually tying under the chin and often framing the face, formerly much worn by women but now worn mostly by children.</li><li>Informal: any hat worn by women.</li><li>Chiefly Scot: a man's or boy's cap.</li><li>A bonnetlike headdress: an Indian war bonnet.</li><li>Any of various hoods, covers, or protective devices.</li><li>A cowl, hood, or wind cap for a fireplace or chimney, to stabilize the draft.</li><li>The part of a valve casing through which the stem passes and that forms a guide and seal for the stem.</li><li>A chamber at the top of a hot-air furnace from which the leaders emerge.</li><li>Chiefly British: an automobile hood.</li><li>Nautical: a supplementary piece of canvas laced to the foot of a fore-and-aft sail, especially a jib, in light winds.</li></ul><p><strong>Verb</strong></p><ul><li>To put a bonnet on.</li></ul>