What does "acyl" mean?

Any of class of organic radicals, RCO-, formed by the removal of a hydroxyl group from a carboxylic acid.

Acyl

Common synonyms include: acyl group, acyl radical, acyl-containing, acyl-related, carbonyl group, carbonyl radical.

/ˈæ.sɪl/ noun

noun ·Rare ·Advanced level

Noun

1
Any of class of organic radicals, RCO-, formed by the removal of a hydroxyl group from a carboxylic acid.
"From ethyleneoxides or ethyleneimines carrying an acyl substituent, with hydrazine and its derivatives (Ch. 3. XV)."
2
any group or radical of the form RCO- where R is an organic group wordnet

"From ethyleneoxides or ethyleneimines carrying an acyl substituent, with hydrazine and its derivatives (Ch. 3. XV)."

Ultimately from Latin ac(eō) + -yl.