The story
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A chemical compound or functional group containing carbon (“organic”) atoms and group 16/chalcogen atoms, but not necessarily exclusively, which are also organic compounds. (ie. carbon dioxide, amongst others, is inorganic, thus not an organochalogen) Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.