lacrimator
noun
lac·ri·ma·tor ˈla-krə-ˌmā-tər 
variants or lachrymator
: a tear-producing substance (such as tear gas)
Word History
Etymology
Latin lacrimare to weep, from lacrima tear — more at lachrymal
First Known Use
1918, in the meaning defined above
Medical Definition
lacrimator
noun
lac·ri·ma·tor
variants also lachrymator
ˈlak-rə-ˌmāt-ər
: a tear-producing substance (as tear gas)