ar·mor (US) or Brit ar·mour 
/ˈɑɚmɚ/ noun
/ˈɑɚmɚ/ noun [noncount] 1 : special clothing that people wear to protect their bodies from weapons
▪ The officers are required to wear bulletproof body armor. ◊Armor commonly refers to the heavy metal suits that men wore long ago when they fought in battles.
▪ medieval suits of armor — see also knight in shining armor at 1knight ◊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.
▪ They watched carefully for any cracks in the other team's armor. ▪ The plan looks good, but we've found/discovered some chinks in its armor. ▪ The scandal revealed/exposed a chink in his seemingly perfect armor. 2 a : a hard covering that protects something (such as a vehicle or an animal)
▪ The shots penetrated/pierced the tank's armor. ▪ an armor-plated vehicle [=a vehicle that is protected by armor; a vehicle that is covered in flat pieces of metal] ▪ The armadillo's armor consists of a series of small, bony plates. — often used before another noun ▪ The ship's hull is reinforced with armor plate/plating.
b : soldiers and vehicles (such as tanks) that are protected with armor
▪ a weapon designed for use against enemy armor
▪ The officers are required to wear bulletproof body armor. ◊Armor commonly refers to the heavy metal suits that men wore long ago when they fought in battles.
▪ medieval suits of armor — see also knight in shining armor at 1knight ◊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.
▪ They watched carefully for any cracks in the other team's armor. ▪ The plan looks good, but we've found/discovered some chinks in its armor. ▪ The scandal revealed/exposed a chink in his seemingly perfect armor.
▪ The shots penetrated/pierced the tank's armor. ▪ an armor-plated vehicle [=a vehicle that is protected by armor; a vehicle that is covered in flat pieces of metal] ▪ The armadillo's armor consists of a series of small, bony plates. — often used before another noun ▪ The ship's hull is reinforced with armor plate/plating.
b : soldiers and vehicles (such as tanks) that are protected with armor
▪ a weapon designed for use against enemy armor
