pentobarbital pentlandite • pentode · · · Info · Definitions · Synonyms · Characters · · pentobarbital · · Text Latin · · Script 13 · · Length Definitions · · · (noun) a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic. Synonyms: pentobarbital sodium, Nembutal, yellow jacket. · · Noun Definition 1 Synonyms · · · pentobarbital sodium · · Synonym 1 nembutal · · Synonym 2 yellow jacket · · Synonym 3 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074