Webster's English Dictionary

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ardor

Cross references:
  1. passion               
 
ar.dor or ar.dour \'a:rd-*r\ n [ME ardour, fr. MF & L; MF, fr. L ardor, fr. 
   arde-re to bu] chiefly Brit rn; akin to OHG essa forge, L aridus dry 1a: 
   warmth of feeling or sentiment : PASSION  1b: extreme vigor or energy : 
   INTENSITY  1c: ZEAL, LOYALTY  2: strong or burning heat