armor plate

or armor plating


noun

a plate or plating of specially hardened steel used to cover warships, tanks, aircraft, fortifications, etc., to protect them from enemy fire.

Origin of armor plate

First recorded in 1860–65
Related formsar·mor·plat·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for armor plate