Entry 1 sense Webster, 1913 Aluminous /(ȧ*lū*mĭ*nŭs)/ · A·lu·mi·nous · IPA 01 a. Pertaining to or containing alum, or alumina; as, aluminous minerals, aluminous solution. 1. Pertaining to or containing alum, or alumina; as, aluminous minerals, aluminous solution.