The Collaborative International Dictionary of English v.0.48:

Nitro-chloroform \Ni`tro-chlo"ro*form\, n. [Nitro- +
   chloroform.] (Chem.)
   Same as Chlorpicrin.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nitrochloroform
    n 1: a heavy colorless insoluble liquid compound that causes
         tears and vomiting; used as a pesticide and as tear gas
         [syn: chloropicrin, nitrochloroform]