tlancochtli. muela dela boca. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 127v. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
TLANCOCH-TLI molar tooth / muela de la boca (M) C and Z agree with M that this refers to molar teeth, but I glosses it as ‘eyetooth, canine tooth.’ See TLAN-TLI. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 284.