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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   armour
       n 1: a military unit consisting of armored fighting vehicles
            [syn: armor, armour]
       2: protective covering made of metal and used in combat [syn:
          armor, armour]
       3: tough more-or-less rigid protective covering of an animal or
          plant [syn: armor, armour]
       v 1: equip with armor [syn: armor, armour]