Armor vs. armour

Armor is the American spelling of the noun meaning a protective covering. Armour is the preferred spelling in all the other main varieties of English. Other than the spelling, there is no difference between the words.


For example, these non-U.S. publications use armour:

He has been training for two months, first starting with a vest and then adding bits of armour gradually. [BBC News]

A new study, published this week in the New England Journal of Medicine, shows that these odd-looking armoured creatures can spread leprosy. [Globe and Mail]

The vehicles are widely used by SWAT teams in the US, and feature advanced bulletproof and blastproof armour and ballistic glass windows. [Canberra Times]

And these American publications use armor:

The men wore heavy body armor even to the latrine inside their base. [NPR]

He seemed infinitely powerful—he had pierced America’s armor, after all—and impossible to reach. [Los Angeles Times]

Emotions, I learned, could be regarded as a chink in the pro-choice armor. [New York Daily News]

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