Riphaean

== English == === Alternative forms === Riphæan, Riphean, Riphœan, Riphoean === Etymology === From Latin Rīphaeus +‎ -an. Compare Rhipaean. === Pronunciation === (UK) IPA(key): /ˈɹɪfɪən/, /ˈɹʌɪfɪən/ === Adjective === Riphaean (not comparable) (now historical) Designating a range of mountains once thought to be located in northern Europe, later considered mythological or identified with the Urals. [from 16th c.] === Proper noun === the Riphaean (geology) An age from 1650 to 650 million years ago, a subdivision of the Proterozoic. === Anagrams === aphrenia