means A soft sedimentary rock made mostly of calcium carbonate, used for building, making cement, and (when polished) countertops.

from A plain Old English compound: 'lim' (lime, the mineral) plus 'stan' (stone) — literally 'lime-stone,' the rock you bake to make lime. The 'lime' here has nothing to do with the fruit; it traces back through Latin 'limus,' meaning slime or sticky mud, a nod to lime's clinging, mortar-making nature.