'flaccid' originates from Latin, specifically the word 'flaccidus,' where 'flaccus' meant 'flabby or drooping.'

'flaccidus' transformed into the Old French word 'flaccide,' and eventually became the modern English word 'flaccid' through Middle English.

Initially, it meant 'flabby or drooping,' but over time it evolved into its current meaning of 'lacking firmness or stiffness.'