ARENACEOUS Meaning of ARENACEOUS in English [ ˌarɪ'neɪʃəs ]■ adjective1》 Geology consisting of sand or sand-like particles. 2》 Biology living or growing in sand.OriginC17: from L. arenaceus , from arena 'sand'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004