limestone

/ˈlaɪmstəʊn/

IPA: /L AY1 M S T OW0 N/

noun
  1. 1

    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.

adjective
  1. 1

    Made of or with limestone.

Source: https://en.wiktionary.org/wiki/limestone