NAIANT Meaning of NAIANT in English [ 'neɪənt ]■ adjective [ postposition ] Heraldry (of a fish or marine creature) swimming horizontally.OriginC16: from Anglo-Norman Fr., var. of OFr. noiant , noier 'to swim'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004