The top portion of a compression valve assembly, it holds the valve in place as it is tightened against the valve seat at the other end of the assembly
The shape of the bonnet varies greatly at different times; formerly the front part projected, and spread outward, like the mouth of a funnel
A metallic canopy, or projection, over an opening, as a fireplace, or a cowl or hood to increase the draught of a chimney, etc
Anything resembling a bonnet in shape or use A small defense work at a salient angle; or a part of a parapet elevated to screen the other part from enfilade fire
A cover for an open fireplace or a cowl or hood to increase the draft of a chimney; metal covering for valve chambers, hydrants, or ventilation
The bonnet of a car is the metal cover over the engine at the front. When I eventually stopped and lifted the bonnet, the noise seemed to be coming from the alternator
A roofing over the cage of a mine, to protect its occupants from objects falling down the shaft
protective covering consisting of a metal part that covers the engine; "there are powerful engines under the hoods of new cars"; "the mechanic removed the cowling in order to repair the plane's engine"