'repellent' originates from Latin, specifically the word 'repellere,' where 're-' meant 'back' and 'pellere' meant 'to drive.'

'repellere' transformed into the French word 'repellent,' and eventually became the modern English word 'repellent' through Middle English.

Initially, it meant 'to drive back,' but over time it evolved into its current meanings of 'causing disgust' and 'a substance to drive away insects.'