Merriam-Webster Collegiate Dictionary - armor

 noun  Etymology: Middle English armure, from Anglo-French, from Latin armatura — more at armature  Date: 13th century  1. defensive covering for the body; especially covering (as of metal) used in combat  2. a quality or circumstance that affords protection the ~ of prosperity  3. a protective outer layer (as of a ship, a plant or animal, or a cable)  4. ~ed forces and vehicles (as tanks)  • ~ transitive verb  • ~less adjective