'grease-free' originates from the combination of 'grease' and 'free', where 'grease' refers to a fatty or oily substance and 'free' means lacking or without.

'grease' comes from the Old French word 'grece', which means fat or grease, and 'free' comes from the Old English 'freo', meaning not in bondage or without.

Initially, 'grease' referred to any fatty substance, and 'free' meant without. Together, they evolved to mean lacking grease.