'atriopore' originates from New Latin/modern scientific coinage, specifically from Latin 'atrium' and Greek 'poros', where 'atrium' meant 'entrance hall' and 'poros' meant 'passage'.

'atriopore' was formed in scientific (zoological/anatomical) usage in the 19th–20th century by combining 'atrium' (Latin) + 'pore' (from Greek 'poros'), and was adopted into modern English technical vocabulary to name the specific opening.

Initially, 'atrium' referred to an entrance hall and 'poros/ pore' to a passage; combined in scientific terminology the compound came to mean specifically 'an opening from an atrium to the outside' in anatomical/zoological contexts.