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

'amphistomos' transformed into the scientific term 'amphistomum' used in modern parasitology.

Initially, it referred to organisms with mouths on both ends, but now it specifically refers to a family of parasitic flatworms.