Where does “transpiration” come from?

transpiration (Middle French) comes from Medieval Latin transpiratio, from Latin transpiro, from Latin trāns, from Latin Padus, from Lepontic Bodincus, from Proto-Indo-European bʰudʰmḗn, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.