'anisoyl-free' originates from modern chemical nomenclature: the element 'anisoyl' (from New Latin/French roots ultimately tied to Latin 'anisum' meaning 'anise') combined with the English word 'free' meaning 'lacking or without'.

'anisoyl' derives from 'anisic'/'anisole' (from Latin 'anisum', Greek 'anison') and the chemical suffix '-oyl' (from 'acyl' via systematic organic-naming conventions); the compound adjective formed by adding English '-free' produced 'anisoyl-free' in modern technical usage.

Initially, 'anisoyl' denoted specifically the acyl radical derived from anisic acid; over time the formation 'anisoyl-free' came to be used in formulations and literature to indicate absence of that group in a substance or product.