FIDUS ACHATES Meaning of FIDUS ACHATES in English [ ˌfʌɪdəs ə'keɪti:z ]■ noun literary a faithful friend or devoted follower.OriginL., lit. 'faithful Achates' (a companion of Aeneas in Virgil's Aeneid ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004