From The Collaborative International Dictionary of English v.0.48 [gcide]:
3. A covering for the head, worn by women, usually protecting more or less the back and sides of the head, but no part of the forehead. The shape of the bonnet varies greatly at different times; formerly the front part projected, and spread outward, like the mouth of a funnel.
4. Anything resembling a bonnet in shape or use; as, (a) (Fort.) A small defense work at a salient angle; or a part of a parapet elevated to screen the other part from enfilade fire. (b) A metallic canopy, or projection, over an opening, as a fireplace, or a cowl or hood to increase the draught of a chimney, etc. (c) A frame of wire netting over a locomotive chimney, to prevent escape of sparks. (d) A roofing over the cage of a mine, to protect its occupants from objects falling down the shaft. (e) In pumps, a metal covering for the openings in the valve chambers.
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