a colourless liquid substance that is a cyclic trimer of acetaldehyde: used in making dyestuffs and as a hypnotic and anticonvulsant drug. Formula: (C2H4O)3
paraldehyde in American English
(pəˈrældəˌhaɪd)
noun
a colorless liquid, C6H12O3, produced by the polymerization of acetaldehyde, having a strong, nauseating smell and used in medicine as a hypnotic and sedative