phenobarbital

• phenobarbitone (UK)

From pheno- +‎ barbital.

• (Received Pronunciation) IPA^(key): /ˌfiː.nə(ʊ)ˈbɑː.bɪt.əl/, /ˌfɛn.ə(ʊ)ˈbɑː.bɪt.əl/
• (General American) IPA^(key): /ˌfiː.noʊˈbɑɹ.bəˌtɔl/

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phenobarbital (countable and uncountable, plural phenobarbitals)

1. (pharmacology) A narcotic and sedative barbiturate drug used chiefly to treat epilepsy.

• purple heart

• “phenobarbitone”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “phenobarbital”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.