teargas

from WordNet (r) 3.0 (2006)
teargas
    n 1: a gas that makes the eyes fill with tears but does not
         damage them; used in dispersing crowds [syn: {tear gas},
         {teargas}, {lacrimator}, {lachrymator}]
    v 1: attack with teargas; subject to teargas fumes; "The
         students were teargassed during the riot"
    

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