armour plate

noun

a tough heavy steel, usually containing chromium, nickel, and molybdenum and often hardened on the surface, used for protecting warships, tanks, etc

The suit contains enough metal to armour plate a small battle ship.

Since his day wooden walls have been replaced by armour plate, and red-hot shot by high-explosive shells.

Every German fired from behind a shield of armour plate, and at every fifteen yards along the trenches there was a machine gun.

Some time ago I saw several pieces of armour-plate which had been used in one of these tests.

Its thick hide studded with bosses was like armour-plate, and over its back impenetrable to bullets.

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