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protected by or .
provided with or using armored equipment, as tanks or armored cars: an armored unit;
an armored patrol.
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

Law enforcement, including helicopters and an FBI armored vehicle, had cut off power to the house and had their guns drawn.
‘Domestic Terrorism’ Kills Six in Oak Creek Sikh Temple Ben Jacobs August 5, 2012

Three armored police vans came barreling down the road firing shotgun pellets out of the turrets normally used to launch teargas.
Egypt’s Government Thugs Beat Me Up at the Rabaa Sit-In Mike Giglio August 13, 2013

Hence the SWAT teams and armored trucks surrounding his house.
Hunt for Iraq Vet After Killing Spree M.L. Nestel December 15, 2014

Her grandfather was decorated for gallantry at Vimy Ridge and went on to found the Canadian armored corps.
Accidents Happen to Gun People Too David Frum January 16, 2013

Dostum was then commander of an armored unit in the army and a member of the Parcham faction.
The Warlord Who Defines Afghanistan: An Excerpt From Bruce Riedel’s ’What We Won’ Bruce Riedel July 26, 2014

Historical Examples

She is an armored cruiser, and is one of the latest and most speedy of that type.
The Progress of Invention in the Nineteenth Century. Edward W. Byrn

This type of termite was armored more poorly than the others.
The Raid on the Termites Paul Ernst

It was a military-looking Jeep, like an armored Hummer, only it didn’t have any military insignia on it.
Little Brother Cory Doctorow

“It would at least be convincing,” the pilot of the armored car declared.
The Boy Scouts on Belgian Battlefields Lieut. Howard Payson

Clutching his gun in his armored hand, Tom crept slowly on to the platform suspended over the sea.
Tom Swift and His Giant Telescope Victor Appleton

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