There are 2 main definitions of rigor in English:

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rigor 1

Pronunciation: /ˈrɪɡɔː/
/ˈrʌɪɡɔː/
/ˈrʌɪɡə/

noun

Medicine
1A sudden feeling of cold with shivering accompanied by a rise in temperature, often with copious sweating, especially at the onset or height of a fever.
1.1 short for rigor mortis.

Origin

Late Middle English: from Latin, literally 'stiffness', from rigere 'be stiff'.

Words that rhyme with rigor

chigger, configure, figure, Frigga, jigger, ligger, rigger, rigour, snigger, swigger, transfigure, trigger, vigour (US vigor)
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There are 2 main definitions of rigor in English:

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rigor 2

noun

US spelling of rigour.
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