Etymology
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armour

chiefly British English spelling of armor (q.v.); for suffix, see -or. Related: Armoured; armourer.

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Definitions of armour
1
armour (n.)
a military unit consisting of armored fighting vehicles;
Synonyms: armor
armour (n.)
protective covering made of metal and used in combat;
Synonyms: armor
armour (n.)
tough more-or-less rigid protective covering of an animal or plant;
Synonyms: armor
2
armour (v.)
equip with armor;
Synonyms: armor
From wordnet.princeton.edu