Note: in AM, use 'armor'
1.
In former times, ~ was special metal clothing that soldiers wore for protection in battle.
...knights in ~.
N-UNCOUNT
2.
Armour consists of tanks and other military vehicles used in battle. (MILITARY)
...the biggest movement of heavy British ~ since the Second World War.
N-UNCOUNT
3.
Armour is a hard, usually metal, covering that protects a vehicle against attack.
...a formidable warhead that can penetrate the ~ of most tanks.
N-UNCOUNT
4.
knight in shining ~: see knight
see also body ~