the GNU version of the Collaborative International Dictionary of English
n. a chemical substance that causes tears to flow; same as lachrymator.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds
Word Usage
"One sulfur product is produced in significant quantities only in the onion, shallot, leek, chive, and rakkyo: the “lacrimator,” which causes our eyes to water."