the.com/ardor
Passion turned up until it gives off heat you can feel.
means Intense warmth of feeling — burning enthusiasm, love, or zeal that fuels action.
from From Latin ardere, to burn — the same fire glowing in ardent and arson, just aimed at feelings instead of buildings.
Literal heatOnce meant actual fiery heat, not just emotion.
Family treeShares its root with ardent and arson.
British spellingBecomes ardour across the Atlantic.