Specially hardened steel plate used to protect fortifications or vehicles from enemy fire(noun)
WordNet. Princeton University. 2010.
Use "armour plate" in a sentence
"The gunners of the 4th Panzer, whose morale had already suffered in their first encounter with Katukov five days earlier, once again saw their shot bouncing off the sloping armour plate of the Russian tanks."
"One of these shells landed on B turret just between the two guns, ripping off the front armour plate and killing eight men at the front of the gunhouse."
"Why did the entire order Edentata all twenty species of armadillo, including the extinct giant armadillo, all six species of sloth, including extinct giant sloths, and all four species of anteater troop off unerringly for South America, leaving not a rack behind, leaving no hide nor hair nor armour plate of settlers somewhere along the way?"