armor

UK: /ˈɑː^rmə^r/ US: /ˈɑrmɚ/ ,(är′mər)

WordReference Random House Learner's Dictionary of American English © 2026

ar•mor /ˈɑrmɚ/   n. 

[uncountable]
1. any covering that serves as a defense or protection against weapons.
2. Military motor-driven units of military forces.

v. [~ + object]

3. to cover or equip with armor.

Also, esp. Brit., ˈar•mour.See -arm-.

WordReference Random House Unabridged Dictionary of American English © 2026

ar•mor  (är′mər), n. 

1. any covering worn as a defense against weapons.
2. a suit of armor.
3. Military a metallic sheathing or protective covering, esp. metal plates, used on warships, armored vehicles, airplanes, and fortifications.
4. Military mechanized units of military forces, as armored divisions.
5. Also called armament. any protective covering, as on certain animals, insects, or plants.
6. any quality, characteristic, situation, or thing that serves as protection:
   A chilling courtesy was his only armor.
7. the outer, protective wrapping of metal, usually fine, braided steel wires, on a cable.

v.t. 

8. to cover or equip with armor or armor plate.

Also,[esp. Brit.,] armour. 

• Latin armātūra armature; assimilated, in Middle English and Anglo-French, to nouns ending in -our -or²
• Anglo-French armour(e), armure Old French armëure
• Middle English armo(u)r, armure 1250–1300

ar′mor•less, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

armor / ˈɑːmə/ noun

1. the US spelling of armour

WordReference Random House Unabridged Dictionary of American English © 2026

ar•mour  (är′mər), n. [Chiefly Brit.]

1. British Terms, Heraldry, Pronouns armor.

Usage

See[-our.]

Ar•mour  (är′mər), n. 

Philip Dan•forth  (dan′fôrth, -fōrth), 1832–1901, U.S. meat-packing industrialist.

Collins Concise English Dictionary © HarperCollins Publishers::

armour, armor / ˈɑːmə/ noun

1. any defensive covering, esp that of metal, chain mail, etc, worn by medieval warriors to prevent injury to the body in battle
2. the protective metal plates on a tank, warship, etc
3. armoured fighting vehicles in general; military units equipped with these
4. any protective covering, such as the shell of certain animals
5. heraldic insignia; arms

verb

1. (transitive) to equip or cover with armour

Etymology: 13th Century: from Old French armure, from Latin armātūra armour, equipment