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allobarbital

(ăl′ō-bärbĭ-tôl′, -tăl′)
n.
  1. A white, crystalline powder used as a sedative and hypnotic.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.