Etymology
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Pentothal

trademark name of an anaesthetic and hypnotic, 1935, refashioning of Thiopental, from pento-, in reference to the methylbutyl five-carbon group (from PIE root *penkwe- "five") + first two letters of thiobarbiturate + chemical product suffix -ol.

updated on October 10, 2017

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Definitions of Pentothal from WordNet

Pentothal (n.)
barbiturate that is a hygroscopic powder (trade name Pentothal) that is a strong barbiturate that acts rapidly; induces a relaxed state when injected as a general anesthetic;
Synonyms: thiopental / thiopental sodium / thiopentobarbital sodium
From wordnet.princeton.edu, not affiliated with etymonline.