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（外衣的）风帽，兜帽
A hood is a part of a coat which you can pull up to cover your head. It is in the shape of a triangular bag attached to the neck of the coat at the back.
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面罩;头罩
A hood is a bag made of cloth, which is put over someone's head and face so that they cannot be recognized or so that they cannot see.
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（汽车的）发动机罩，引擎罩
The hood of a car is the metal cover over the engine at the front.
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折叠式车篷;（设备上的）罩，防护罩
A hood is a covering on a vehicle or a piece of equipment, which is usually curved and can be removed.
例句
Why aren't all lenses supplied with a lens hood?
为什么不给所有的镜头都配上遮光罩呢？
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抽油烟机;（厨房）排气罩
A cooker hood is an electrical device fitted over a cooker above head height, and containing an extractor fan and usually a light.