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