An abundant rock of marine and fresh-water sediments; primarily composed of calcite (CaCO₃); it occurs in a variety of forms, both crystalline and amorphous.

plural of limestone

(geology) A natural karst landform consisting of a flat limestone slabs (clints) separated by fissures (grikes).

A limestone which contains some clay, and which yields a quicklime that will set, or form a firm, strong mass, underwater.

The plant Crepis intermedia.

plural of limestone pavement

One of 67 counties in Alabama, United States. County seat: Athens. Named after Limestone Creek. / One of 254 counties in Texas, United States. County seat: Groesbeck.

plural of hydraulic limestone

A yellowish, compact, fine-grained slaty limestone used in lithography.

(geology) A series of limestone strata separating the Old Red Sandstone from the coal-measures.