‖n. [ L. aquarius, adj., relating to water, and n., a water-carrier, fr. aqua. See Aqua. ] (Astron.) (a) The Water-bearer; the eleventh sign in the zodiac, which the sun enters about the 20th of January; -- so called from the rains which prevail at that season in Italy and the East. (b) A constellation south of Pegasus. [ 1913 Webster ]