aquariumn.[L. See Aquarius, Ewer.] An artificial pond, or a globe or tank (usually with glass sides), in which living specimens of aquatic animals or plants are kept.()n.[L. aquarius, adj., relating to water, and n., a water-carrier, fr. aqua. See Aqua.] (Astron.) 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.()