GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Paraldehyde (?), n. [Pref. para- + aldehyde.] (Chem.) A trimer of acetaldehyde (C6H12O3), prepared by polymerization of acetaldehyde with hydrochloric and sulfuric acids.  It has sedative and hypnotic properties. MI11
   
   [PJC]