a tutor, a teacher, one who instructs someone (see Karttunen and Molina)
IPAspelling:
teːiskɑliɑːni
Alonso de Molina:
teizcaliani. el que industria y doctrina a otro. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 96r. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
TĒIZCALIĀNI tutor, one who instructs someone / el que industria y doctrina a otro (M) [(1)Cf.52v]. See (I)ZCALIĀ. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 220.