Chloropicrin

noun

1. An oily colorless liquid, CCl3NO2, that causes skin, lung, and mucous membrane irritation and is used in tear gas and in dyestuffs, disinfectants, insecticides, and soil fumigants.
2. A pungent colorless liquid (CNO2Cl3), the vapor of which attacks the eyes powerfully.
3. The chlorinated derivative of nitromethane CCl3NO2 that is used as a pesticide and tear gas
4. a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas