armour plate BrE
armour plating BrE
armor plate AmE
armor plating AmE

In order to save weight most of the armour plating was deleted.

The armour plating was hit and control cables were almost severed.

I understand you've had armour plating installed behind your seat.

The elephants were protected by armour plating on their fronts.

As protection against the worm, you wore armour plating - more of it, perhaps, than was necessary.

Then, on the next trip, he took off the armour plating in his works at Reculver.

She seemed to have her own armour plating to protect her emotions.