rigour
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is spelt -our in British English and rigor in American English. The corresponding adjective is rigorous in both varieties. Note also the spelling rigor in the medical sense ('a sudden feeling of cold and shivering') and in the Latin phrase rigor mortis, the stiffening of the body after death.
| rightward, rightwards, right, rightly, rid | |
| ring, riot, risky, risqué |
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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