Meaning

noun any group or radical of the form RCO- where R is an organic group

originEtymology tree Proto-Indo-European *h₂eḱ- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂eḱéh₁yeti Proto-Italic *akēō Latin aceō Proto-Indo-European *swel-der.? Ancient Greek ῡ̔́λη (hū́lē)der. Frenchder. English -yl English acyl Ultimately from Latin ac(eō) + -yl.

Etymology from Wiktionary, CC BY-SA 3.0