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[fee-noh-bahr-bi-tawl, -tal, -nuh-] /ˌfi noʊˈbɑr bɪˌtɔl, -ˌtæl, -nə-/
noun, Pharmacology
a white, crystalline powder, C 1 2 H 1 2 N 2 O 3 , used as a sedative, a hypnotic, and as an antispasmodic in epilepsy.
Also, especially British, phenobarbitone
[fee-noh-bahr-bi-tohn, -nuh-] /ˌfi noʊˈbɑr bɪˌtoʊn, -nə-/ (Show IPA)
Origin of phenobarbital
1915-20; pheno- + barbital Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for phenobarbital


a white crystalline derivative of barbituric acid used as a sedative for treating insomnia and as an anticonvulsant in epilepsy. Formula: C12H12N2O3
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for phenobarbital

1919, from pheno- + barbital (see barbiturate).

Online Etymology Dictionary, © 2010 Douglas Harper
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phenobarbital in Medicine

phenobarbital phe·no·bar·bi·tal (fē'nō-bär'bĭ-tôl', -tāl')
A crystalline barbiturate used as a sedative, a hypnotic, and an anticonvulsant.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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phenobarbital in Science
  (fē'nō-bär'bĭ-tôl', -tāl')   
A crystalline barbiturate used as a sedative and an anticonvulsant. Chemical formula: C12H12N2O3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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