limestone

Pronunciation: /ˈlaɪmˌstoʊn/ (American English)

Origin: Middle English, from lime + stone

Part of Speech: noun

Meanings:

1. A sedimentary rock composed mainly of calcium carbonate (CaCO₃), often formed from the skeletal remains of marine organisms.
2. A type of rock used in construction and agriculture.

Example Sentences:

1. The cliffs along the coast are made of white limestone.
2. Farmers often use crushed limestone to reduce soil acidity.
3. Many ancient buildings in Rome were constructed using limestone blocks.

Related Words:

• Forms: (no other forms)
• Synonyms: calcite, chalk, calcium carbonate

Memorization Trick: Think of "limestone" as "lime + stone." Lime is rich in calcium, and this rock is essentially calcified stone formed over millions of years.

Additional Information: Limestone is a key ingredient in cement production and is also used in the manufacturing of glass and steel. It's a relatively soft rock that can be easily carved, making it popular in sculpture and architecture throughout history.