There are 2 definitions of rigor in English:

rigor1

Line breaks: rigor
Pronunciation: /ˈrɪɡɔː
 
, ˈrʌɪɡɔː
 
, -ɡə/

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'.

Definition of rigor in:

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Word of the day impudicity
Pronunciation: ˌimpyəˈdisitē
noun
lack of modesty