plate armor plate armor /pleɪt ˈɑːrmər/

noun

1. [American] Specially hardened steel plate used to protect fortifications or vehicles from enemy fire  ( armor plate [American] , armor plating [American] , armour plate [Canadian, British] , plate armor [American] , plate armour [Canadian, British] , armour plating [Canadian, British] )
   specially hardened steel plate used to protect fortifications or vehicles from enemy fire