a. Of or pertaining to the Englishman J. L. M. Smithson, or to the national institution of learning which he endowed at Washington, D. C.; as, the Smithsonian Institution; Smithsonian Reports. -- n. The Smithsonian Institution. [ 1913 Webster ]

n. [ See Smithsonian. ] (Min.) Native zinc carbonate. It generally occurs in stalactitic, reniform, or botryoidal shapes, of a white to gray, green, or brown color. See Note under Calamine. [ 1913 Webster ]