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any covering worn as a defense against weapons.
a suit of armor.
a metallic sheathing or protective covering, especially metal plates, used on warships, vehicles, airplanes, and fortifications.
mechanized units of military forces, as 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.
to cover or equip with armor or .
Contemporary Examples

Later customs as to what weapons were allowed became more elaborate, but equality of armor and weapons was still the expectation.
The ‘GOT’ Red Viper and Mountain Duel, and a History of Medieval Trial by Combat Steven Isaac June 2, 2014

The little black dress is “like armor” in the sense that it bestows confidence on its wearer, Steele says.
From the Anti-Rape Bra to Chastity Belts: How Women Use Clothing for Protection Soraya Roberts June 4, 2013

A similar pattern occurred when metal swords, armor, cavalry charges and dense infantry ranks developed.
War! What Is It Good For? A Lot Nick Romeo August 12, 2014

The house, founded in 1992 by Lee Alexander McQueen, has found its inspiration in everything from medieval armor to witch-hunts.
Michelle Obama in Alexander McQueen: Lady in Red Robin Givhan January 18, 2011

This would seem reasonable, since in that direction lay the only territory open enough for swift attack by armor.
Blood in the Sand: When James Jones Wrote a Grunt’s View of D-Day James Jones November 14, 2014

Historical Examples

“Our only armor against such influences is firm principle,” answered the old man, encouragingly.
Father Brighthopes John Townsend Trowbridge

He is fitted for his vocation; he has watched all night by his armor.
The Works of Whittier, Volume VI (of VII) John Greenleaf Whittier

These fought bravely and defied the Grecian spears with the strength of their armor.
Historic Tales, vol 10 (of 15) Charles Morris

Longfellow’s Skeleton in armor has revealed their temporary settlement.
The Bay State Monthly, Vol. 1, Issue 1. Various

On the drenched earth the armor and arms swam in the blood of the enemy as in a river.
History Of Ancient Civilization Charles Seignobos

noun
the US spelling of armour
n.

c.1300, “mail, defensive covering worn in combat,” also “means of protection,” from Old French armeure “weapons, armor” (12c.), from Latin armatura “arms, equipment,” from arma “arms, gear” (see arm (n.2)). Figurative use from mid-14c.

Meaning “military equipment generally,” especially siege engines, is late 14c. 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).
v.

mid-15c., from armor (n.). Related: Armored; armoring.
see:

chink in one’s armor
knight in shining armor