noun
US or Brit armour
[noncount] special clothing that people wear to protect their bodies from weapons
Armor commonly refers to the heavy metal suits that men wore long ago when they fought in battles.
A chink/crack in someone's or something's armor is a weakness that might cause someone or something to fail or to be defeated.
a hard covering that protects something (such as a vehicle or an animal)
soldiers and vehicles (such as tanks) that are protected with armor