| limestone | | |
| n. (substance) | 1. limestone | a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals. |
| ~ atomic number 20, ca, calcium | a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals. |
| ~ atomic number 6, carbon, c | an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds. |
| ~ rock, stone | material consisting of the aggregate of minerals like those making up the Earth's crust.; "that mountain is solid rock"; "stone is abundant in New England and there are many quarries" |
| ~ sedimentary rock | rock formed from consolidated clay sediments. |
| ~ calcite | a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone. |
| ~ rottenstone, tripoli | a weathered and decomposed siliceous limestone; in powdered form it is used in polishing. |
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