Definition from Wiktionary, the free dictionary
Alternative forms 
- rigor (US)
rigour (plural rigours)
- Severity or strictness.
- A trembling or shivering response.
- Character of being unyielding or inflexible.
- Shrewd questioning.
- Higher level of difficulty.
- (UK, slang) Common misspelling of rigor. An abbreviated form of rigour mortis.
Related terms 
a trembling or shivering response
character of being unyielding or inflexible
an abbreviated form of rigor mortis
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