The metal suit worn by knights as protection in battle is called armor. You can still see suits of armor in many museums today.

These days, soldiers still use armor to protect them from bullets and other weapons, though it's not usually made of metal. Modern armor, like bullet-proof vests, is made of extremely strong, dense fabric, while 13th century armor was typically made of steel. In the 14th century, the word itself meant "defensive covering worn in combat" and "means of protection," from the Old French armeure, "weapons or armor," with its Latin root, arma, "arms or gear."

Definitions of armor
  1. noun
    protective covering made of metal and used in combat
    synonyms: armour
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    body armor, body armour, cataphract, coat of mail, suit of armor, suit of armour
    armor that protects the wearer's whole body
    buckler, shield
    armor carried on the arm to intercept blows
    bulletproof vest
    a vest capable of resisting the impact of a bullet
    chain armor, chain armour, chain mail, mail, ring armor, ring armour, ring mail
    (Middle Ages) flexible armor made of interlinked metal rings
    corselet, corslet
    a piece of body armor for the trunk; usually consists of a breastplate and back piece
    medieval body armor that covers the chest and back
    escutcheon, scutcheon
    a shield; especially one displaying a coat of arms
    pavis, pavise
    (Middle Ages) a large heavy oblong shield protecting the whole body; originally carried but sometimes set up in permanent position
    type of:
    protection, protective cover, protective covering
    a covering that is intend to protect from damage or injury
  2. noun
    tough more-or-less rigid protective covering of an animal or plant
    synonyms: armour
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    type of:
    protective covering
    the tough natural covering of some organisms
  3. noun
    a military unit consisting of armored fighting vehicles
    synonyms: armour
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    type of:
    force, military force, military group, military unit
    a unit that is part of some military service
  4. verb
    equip with armor
    synonyms: armour
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    type of:
    equip, fit, fit out, outfit
    provide with (something) usually for a specific purpose
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