From Latin 'ardor' (a burning), from 'ardēre' (to burn), from PIE *h₂eHs- — passion is fire, and 'arid' is dry as if burned.
Great enthusiasm or passion; intense heat.
From Latin ardor (a burning, a fire, a flame, intense heat), from ārdēre (to burn, to be on fire, to blaze), from PIE *h₂eHs- (to burn, to be dry, to parch). The PIE root *h₂eHs- produced Latin āridus (dry, parched), English arid; Latin ārea (a threshing floor, a dry open space), English area; and possibly Latin āra (an altar, where fire burned). The connection between dryness and burning is ancient: the same root covers the parched land
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