paraldehyde

from WordNet (r) 3.0 (2006)

paraldehyde
    n 1: a colorless liquid (a cyclic trimer of acetaldehyde) that
         is used as a sedative and a solvent [syn: {paraldehyde},
         {ethanal trimer}]

from The Collaborative International Dictionary of English v.0.48

Paraldehyde \Par*al"de*hyde\, 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]