noun
also tri·chlor·phon (ˈ)trīˈklō(ə)rˌfȧn, -ˈklȯ(ə)r-
( -s )
Etymology: tri- + chlor- + -fon (irregular from phosphonate )
: an organophosphate C 4 H 8 Cl 3 O 4 P that is used as a parasiticide in veterinary medicine and as an insecticide in agriculture