ipotoctli. baho. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 42r. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
IHPOTOC-TLI vapor, steam, exhalation, breath / vaho (M), humo, vapor, exhalación (S) [(6)Zp.127,158]. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 99.