[pen-tuh-bahr-bi-tawl, -tal]
noun Pharmacology.
a barbiturate, C 1 1 H 1 7 N 2 O 3 , used as a hypnotic and as a sedative.

1930–35; pent- + -o- + barbital Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Pentobarbital is sedative, which is a medicine that makes you sleepy.
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