'fluid-based' originates from the combination of 'fluid' and 'based', where 'fluid' comes from Latin 'fluidus', meaning 'flowing', and 'based' is derived from the Old French 'basse', meaning 'foundation'.

'fluid' changed from the Latin word 'fluidus' and eventually became the modern English word 'fluid'. 'Based' evolved from the Old French 'basse' to the modern English 'based'.

Initially, 'fluid' meant 'flowing', and 'based' meant 'foundation'. Together, they evolved to describe something derived from or composed of fluids.