apoctli.

Headword: 
apoctli.
Principal English Translation: 

water vapor; or, a rain squall with wind (see Karttunen); water steam (for inhalation) (see Molina)

IPAspelling: 
ɑːpoːktɬi
Alonso de Molina: 

apoctli. baho de agua.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 7r. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

ĀPŌC-TLI water vapor; rain squall with wind; c/ exhalación, vapor de agua (S), llueve con viento (T)[(1)Tp.171]. See Ā-TL, PŌC-TLI.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 12.