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The Collaborative International Dictionary
Octoyl

Octoyl \Oc"to*yl\, n. [Octoic + -yl.] (Chem.) A hypothetical radical ( C7H15.CO.), regarded as the essential residue of octoic acid.

Wiktionary
octoyl

n. (context organic chemistry English) A hypothetical radical, C8H15O, regarded as the essential residue of octoic acid.