- a sedimentary rock consisting mainly of calcium carbonate, deposited as the calcareous remains of marine animals or chemically precipitated from the sea: used as a building stone and in the manufacture of cement, lime, etc
WordReference Random House Learner's Dictionary of American English © 2026
lime•stone /ˈlaɪmˌstoʊn/USA pronunciation
n. [uncountable]
WordReference Random House Unabridged Dictionary of American English © 2026- Geology, Rocksa rock made up mostly of calcium carbonate, some of which is formed from the skeletons of tiny sea organisms and coral.
lime•stone
(līm′stōn′),USA pronunciation n.
- Geology, Rocksa sedimentary rock consisting predominantly of calcium carbonate, varieties of which are formed from the skeletons of marine microorganisms and coral: used as a building stone and in the manufacture of lime. Cf. marble.
- lime1 + stone 1515–25
Collins Concise English Dictionary © HarperCollins Publishers::
limestone /ˈlaɪmˌstəʊn/ n