chloropicrin
noun
chlo·ro·pic·rin ˌklȯr-ə-ˈpi-krən 
: a colorless liquid CCl3NO2 that causes tears and vomiting and is used especially as a soil fumigant
Example Sentences
Recent Examples on the Web Maine’s Department of Environmental Protection website says the plant had several owners from 1967 through 2000 and produced chlorine, sodium hydroxide, chlorine bleach, hydrochloric acid and the pesticide chloropicrin. 
Washington Post, 1 Sep. 2017 Historically, chloropicrin has been found most effective when used in combination with methyl bromide, which has been found to be extremely harmful to the ozone layer. Mike Sager, Esquire, 25 Feb. 2015
Washington Post, 1 Sep. 2017 Historically, chloropicrin has been found most effective when used in combination with methyl bromide, which has been found to be extremely harmful to the ozone layer. Mike Sager, Esquire, 25 Feb. 2015 Word History
Etymology
German Chlorpikrin, from chlor- + Greek pikros sharp — more at paint
First Known Use
circa 1889, in the meaning defined above
Medical Definition
chloropicrin
noun
chlo·ro·pic·rin ˌklōr-ə-ˈpik-rən, ˌklȯr-
: a heavy colorless liquid CCl3NO2 that causes tears and vomiting and is used especially as a soil fumigant
called also nitrochloroform