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gasmask
From The Collaborative International Dictionary of English v.0.48:
gasmask \gasmask\ n.
a mask with a filter which protects the face and lungs
against poisonous gases. It is used in warfare, and also by
police to allow them to effectively use tear gas or other
disabling gas to disperse a crowd or force fugitives to leave
a building.
Syn: respirator, gas helmet.
[WordNet 1.5]

