'trematode' originates from Greek, specifically the word 'trēmatōdēs,' where 'trēma' meant 'hole' or 'perforation.'

'trēmatōdēs' transformed into the Latin word 'trematoda,' and eventually became the modern English word 'trematode.'

Initially, it referred to organisms with perforated bodies, and this meaning has largely remained the same in modern usage.