1595–1605; armor + -ed3

unarmored, adjective
well-armored, adjective Unabridged


any covering worn as a defense against weapons.
a suit of armor.
a metallic sheathing or protective covering, especially metal plates, used on warships, armored vehicles, airplanes, and fortifications.
mechanized units of military forces, as armored divisions.
Also called armament. any protective covering, as on certain animals, insects, or plants.
any quality, characteristic, situation, or thing that serves as protection: A chilling courtesy was his only armor.
the outer, protective wrapping of metal, usually fine, braided steel wires, on a cable.
verb (used with object)
to cover or equip with armor or armor plate.
Also, especially British, armour.

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

armorless, adjective
antiarmor, adjective
subarmor, noun

amour, armoire, armor. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
armor (ˈɑːmə)
the US spelling of armour

armoured or (US) armored (ˈɑːməd)
1.  having a protective covering, such as armour or bone
2.  comprising units making use of armoured vehicles: an armoured brigade
3.  (of glass) toughened
armored or (US) armored

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "mail, defensive covering worn in combat," from O.Fr. armeure (12c.), from L. armatura "arms, equipment," from arma "arms, gear" (see arm (2)). The word might have died with jousting if not for late 19c. transference to metal-shielded machinery beginning with U.S. Civil
War ironclads (first attested in this sense in an 1855 report from the U.S. Congressional Committee on Naval Affairs).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The new enemy was agile and light, and outmatched the lumbering, heavily
  armored cavalry and infantry.
Likewise heavily armored beetles trust in their protection and also wait out
  the swarm.
The royal couple were unharmed, but made the return journey home after the
  performance in an armored police truck.
They wished to be certain that these quotations were both accurate and armored
  against challenge.
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