One of the mysteries of the English language finally explained.
= Riphaean. Frequently in "Rhipaean mountains".
Early 18th century. From classical Latin Rīpaeus, Rhīpaeus and its etymon ancient Greek Ῥιπαῖος of or belonging to the Rhipaean mountains (from Ῥίπαι, name of a mythical mountain range + -αῖος, suffix forming adjectives) + -an.
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