Armor (noun)

1. Protective covering made of metal or other strong material to protect the body in battle.
2. Protection from harm or damage.

Origin:

From the old french word "armure" meaning "a covering for the body to protect against weapons".

Examples:

1. The knight wore heavy armor.
2. The tank had thick armor.
3. The company's new product has a built-in armor for protection.
4. The sea turtle has a natural armor for protection.
5. He has a strong emotional armor to protect himself from hurt.