Antarctic

From Middle English antartik, antartyk, from Middle French antartique, from Latin antarcticus, from Ancient Greek ἀνταρκτικός (antarktikós), from ἀντί (antí, “opposite”) + ἀρκτικός (arktikós, “Arctic”) + -ικός (-ikós, “-ic”). By surface analysis, anti- +‎ Arctic.