'envenom' originates from Old French, specifically the word 'envenimer,' where 'en-' meant 'in' and 'venim' meant 'poison.'

'envenimer' transformed into the Middle English word 'envenimen,' and eventually became the modern English word 'envenom.'

Initially, it meant 'to poison,' but over time it evolved to include the meaning of 'to embitter or make hostile.'