naevusEnglishOxford Dictionary of Englishnaevus /ˈniːvəs / (US English nevus) ▸ noun (plural naevi /ˈniːvʌɪ, ˈniːviː/) a birthmark or a mole on the skin, especially a birthmark in the form of a raised red patch. – ORIGIN late 17th century: from Latin.