ontlapal.

Headword: 
ontlapal.
IPAspelling: 
ontɬɑpɑl
Alonso de Molina: 

ontlapal. de dos lados.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 77r. col. 2. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

ONTLAPAL on, from both sides / de dos lados (M), de ambos lados (C) [(4)Cf.92v]. C does not mark the vowel of the first syllable long in any of the attestations. See ŌME, TLAPAL-LI.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 179.