'methoxybenzoyl-containing' originates from Modern English chemical nomenclature, specifically formed by combining the elements 'methoxy' + 'benzoyl' + 'containing', where 'methoxy' denotes a -OCH3 group, 'benzoyl' denotes a benzene-derived acyl group, and 'containing' denotes possession or inclusion.

'methoxy' developed in chemical terminology in the 19th century from 'methoxyl' (based on 'methyl' + the 'oxy' element), 'benzoyl' comes via French/Latin naming of benzoic/benzoyl derivatives (originally from substances called benzoin), and these roots were concatenated with the English present-participle/adjective-former 'containing' to create the compound adjective used in modern chemistry.

Initially the component terms named distinct functional groups or roots; over time they began to be combined in systematic chemical nomenclature to form compound adjectives directly indicating the presence of those groups — the current meaning is a straightforward descriptor: 'having a methoxy-substituted benzoyl group.'