limestone

Short definition from Wiktionary

Noun

1. 1
   An abundant rock of marine and freshwater sediments; primarily composed of calcite (CaCO₃); and occurring in a variety of forms, both crystalline and amorphous.

Proper noun

1. 1
   A number of places in the United States: A township and village therein, in Kankakee County, Illinois.
2. 2
   A number of places in the United States: A town and census-designated place therein, in Aroostook County, Maine.
3. 3
   A number of places in the United States: A township and unincorporated community therein, in Alger County, Michigan.
4. 4
   A number of places in the United States: A hamlet and census-designated place in the town of Carrollton, Cattaraugus County, New York.
5. 5
   A number of places in the United States: A census-designated place in Rogers County, Oklahoma.
6. 6
   A number of places in the United States: An unincorporated community in Washington County and Greene County, Tennessee.
7. 7
   A number of places in the United States: An unincorporated community in Marshall County, West Virginia.
8. 8
   A number of places in the United States: A number of other townships, including five in Pennsylvania, listed under Limestone Township.
9. 9
   A place in Canada: A community in Carleton County, New Brunswick.
10. 10
    A place in Canada: A community in Victoria County, New Brunswick.
11. 11
    A place in Australia: A locality in Rockhampton Region, Queensland.
12. 12
    A place in Australia: A locality in the Shire of Murrindindi, Victoria.