Met′a‐cro″le‐in (?), n. [Pref. met- + acrolein.] (Chem.) A polymeric modification of acrolein obtained by heating it with caustic potash. It is a crystalline substance having an aromatic odor.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.