'amphistoma' originates from Greek, specifically the word 'amphistomos,' where 'amphi-' meant 'both' and 'stoma' meant 'mouth.'

'amphistomos' transformed into the scientific term 'amphistoma' used in modern taxonomy.

Initially, it meant 'having a mouth at both ends,' but over time it evolved into its current meaning of a specific type of parasitic flatworm.