'abhorrer' originates from Latin, specifically the word 'abhorrere,' where 'ab-' meant 'away from' and 'horrere' meant 'to shudder.'

'abhorrere' transformed into the Old French word 'abhorrer,' and eventually became the modern English word 'abhor' through Middle English.

Initially, it meant 'to shudder away from,' but over time it evolved into its current meaning of 'to detest or loathe intensely.'