Metacrolein
Pronunciation : Met`a*cro"le*in
Part of Speech : n.
Etymology : [Pref. met- + acrolein.] (Chem.)
Definition : Defn: A polymeric modification of acrolein obtained by heating it with caustic potash. It is a crystalline substance having an aromatic odor.
Source : Webster's Unabridged Dictionary, 1913