Webster's English Dictionary

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rigor

Cross references:
  1. difficulty            
 
rig.or or rig.our \'rig-*r, 2 & 5 are also 'ri--.go.(*)r\ \'rig-*r\ n [ME 
   rigour, fr. MF rigueur, fr. L rigor, lit., stiffness, fr.] chiefly Brit  
   rige-re to be stiff 1a1: harsh inflexibility in opinion, temper, or 
   judgment : SEVERITY  1a2: the quality of being unyielding or inflexible : 
   STRICTNESS) M  1a3: AUSTERITY  1b: an act or instance of strictness, 
   severity, or cruelty  2: a tremor caused by a chill  3: a condition that 
   makes life difficult, challenging, or uncomfortable; Xesp : extremity of 
   cold 4: strict precision : EXACTNESS {logical ~}  obs  5a: RIGIDITY, 
   STIFFNESS  5b: rigidness or torpor of organs or tissue that prevents 
   response to stimu li