'antaean' originates from Latin/Greek, specifically the name 'Antaeus' (Latin) ultimately from Greek 'Antaios', the name of a Libyan giant in Greek mythology.

'antaean' developed as an English adjective formed from the classical name 'Antaeus' (Latin) / 'Antaios' (Greek), passing into Middle English usage and later into modern English as 'antaean'.

Initially it meant 'of or relating to Antaeus' (the mythic figure); over time it has also been used more broadly to describe something 'giant-like' or possessing tremendous size or strength.