noun

limestone

limestone

Limestone is a common sedimentary rock.

Limestone is a common sedimentary rock.

The cliffs are made of white limestone.

The cliffs are made of white limestone.

((noun)) a type of rock used in building. Limestone is a common building material.

Synonyms: chalk, marble, sandstone

From 'lime' (a calcium-containing material) + 'stone'. It's literally a stone that contains lime.

Imagine a stone that looks like a slice of lime, or a stone used to make lime for building.

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