tear gas

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a gas that makes the eyes fill with tears but does not damage them;
used in dispersing crowds
• Syn:
teargas, lacrimator, lachrymator
• Hypernyms:
gas, chemical weapon
• Hyponyms:
chlorobenzylidenemalononitrile, CS gas, chloroacetophenone, CN gas, nitrochloromethane