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Adjective: armor-plated  'aar-mur,pley-tid
Usage: US (elsewhere: armour-plated)
  1. Covered with heavy steel
    "armor-plated vehicles";
    - armor-clad [US], armour-clad [Brit, Cdn], armour-plated [Brit, Cdn], steel-plated

See also: armored [US], armoured [Brit, Cdn]