'actiniaria' originates from Greek, specifically the word 'aktis,' where 'aktis' meant 'ray' or 'beam,' referring to the radial symmetry of the organisms.

'aktis' transformed into the Latin word 'actinia,' and eventually became the modern scientific term 'actiniaria.'

Initially, it referred to the radial structure of the organisms, and this meaning has largely remained the same in modern usage.