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.