Limestone (noun)

A sedimentary rock composed primarily of calcium carbonate, often formed from the accumulation of the skeletons of marine organisms such as coral, shells and algae.

Origin:

Derived from the old english word 'līmstān', which means 'stone made of lime'. first recorded in english in the 15th century.

Examples:

1. The Great Pyramids of Egypt were constructed from limestone.
2. The local quarry supplied limestone for the construction of many buildings in the area.
3. Limestone is a common rock used in construction and road building.
4. The geologists studied the limestone formations in the area.
5. The artist carved the statue from a block of limestone.