PRUINOSE Meaning of PRUINOSE in English [ 'pru:ɪnəʊs , -z ]■ adjective chiefly Botany covered with white powdery granules; frosted in appearance.OriginC19: from L. pruinosus , from pruina 'hoar frost'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004