n. A deposit of carbonate of lime, usually resembling in form a huge icicle, which hangs from the roof of a cave or subterranean rock-opening, where it has been slowly formed by deposition from calcareous water trickling downward through cracks or openings in the rocks above.n. A similar form of some other mineral species, such as are occasionally observed, for example, of chalcedony, limonite, etc., but only sparingly and on a small scale.n. A like form of lava sometimes observed in connection with volcanic outflows.n. In decorative architecture of certain schools, a pendent ornament with sharp edges and generally one of many in a group.