rigor1
/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'.
Rhymes
rigor2
noun
US spelling of rigour.