allobarbital

[ ăl′ō-bärbĭ-tôl′, -tăl′ ]

n.

A white, crystalline powder used as a sedative and hypnotic.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.