[fee-noh-bahr-bi-tawl, -tal, -nuh-]
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-] .

1915–20; pheno- + barbital Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phenobarbital (ˌfiːnəʊˈbɑːbɪtəl)
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 10th Edition
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American Heritage
Medical Dictionary

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

phenobarbitone phe·no·bar·bi·tone (fē'nō-bär'bĭ-tōn')

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
phenobarbital   (fē'nō-bär'bĭ-tôl', -tāl')  Pronunciation Key 
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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