'fossil-based' originates from the word 'fossil,' which comes from the Latin word 'fossilis,' meaning 'dug up.' The suffix '-based' indicates reliance or foundation on something.

'fossilis' transformed into the French word 'fossile,' and eventually became the modern English word 'fossil.' The term 'fossil-based' emerged in the context of energy and industry.

Initially, 'fossil' referred to anything dug up from the ground, but over time it evolved to specifically mean remains of ancient organisms, leading to the term 'fossil-based' in energy contexts.