Question

Armour

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Merriam-Webster's Collegiate DictionaryAr·mour \ˈär-mər\ biographical namePhilip Danforth 1832-1901 American industrialistar·mourchiefly British variant of armor
English Etymologyarmour  British spelling of armor (q.v.); for suffix, see -or.
Oxford Collocations Dictionary for Students of EnglishOxford Collocations dictionary for students of Englisharmour noun ADJ. full, heavy | light | body the police should be protected by body armour. | protective VERB + ARMOUR have on, wear | put on, take off | penetrate, pierce An arrow had pierced his armour. PREP. in ~ warriors in full armour PHRASES a suit of armour He wore a suit of heavy armour and carried a sword. Oxford Advanced Learner's Dictionary-牛津双解-OALD7armourar·mour (BrE) (NAmE armor) / 5B:mE(r); NAmE 5B:rm- / noun[U] 1. special metal clothing that soldiers wore in the past to protect their bodies while fighting   盔甲；甲胄:   a suit of armour    一副盔甲   (figurative) Monkeys do not have any kind of protective armour and use their brains to solve problems.    猴子没有任何防身的盔甲,就动脑筋解决问题。 2. metal covers that protect ships and military vehicles such as tanks   (军舰、坦克等的)装甲,防弹钢板3. (technical 术语) military vehicles used in war   装甲部队；装甲车辆:   an attack by infantry and armour    步兵和装甲兵的进攻  IDIOMS ⇨ see chink n., knight n. 
Webster's Third New International Dictionary, Unabridgedar·mour\ˈȧmə(r\chiefly Britain variant of armor

Armour Armour Ar·Mour Suit Chiefly Variant Armor Heavy