armor
US /ˈɑːr.mɚ/
UK /ˈɑːr.mɚ/

1.
protective covering, especially for the body, used in combat or warfare
:
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The knight wore a full suit of armor into battle.
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Modern tanks are protected by thick steel armor.
2.
the tough, protective outer layer of an animal, plant, or other organism
:
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The turtle's shell provides natural armor.
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Some fish have bony plates that act as armor.