pentobarbital

US: (pen′tə bär′bi tôl′, -tal′)

WordReference Random House Unabridged Dictionary of American English © 2025

pen•to•bar•bi•tal  (pen′tə bär′bi tôl′, -tal′), n. [Pharm.]

1. a barbiturate, C₁₁H₁₇N₂O₃, used as a hypnotic and as a sedative.

• pent- + -o- + barbital 1930–35

Collins Concise English Dictionary © HarperCollins Publishers::

pentobarbital sodium, pentobarbital / ˌpɛntəˈbɑːbɪtəl/, pentobarbitone / ˌpɛntəˈbɑːbɪˌtəʊn/ noun

1. a barbiturate drug used in medicine as a sedative and hypnotic. Formula: C₁₁H₁₇N₂O₃Na