'acetylperoxide' originates from 'acetyl' and 'peroxide', where 'acetyl' refers to the acetyl group (CH3CO) and 'peroxide' refers to a compound containing an oxygen-oxygen single bond.

'acetylperoxide' was formed by combining the terms 'acetyl' and 'peroxide' to describe a specific chemical compound.

Initially, it meant 'a compound containing acetyl and peroxide groups', and this meaning has largely remained the same in modern usage.