Other forms: limestones
Limestone is a pale rock formed from ancient sea shells. Limestone cliffs, a limestone quarry, built of limestone.
It is made of the compacted remains of shells and coral, so a cliff of it is a graveyard of an ancient sea. Rainwater slowly dissolves it, which is why caves, gorges and sinkholes form in limestone country and nowhere else.
1nounlimestoneA pale rock formed from ancient sea shells.
“The old church was built from pale limestone that glows in the evening sun.”
limestone is a rock.
From lime + stone.
Etymology from Wiktionary, CC BY-SA