a child's tutor, female or male; a nanny; a governess (see Molina)
Alonso de Molina:
tlacazcalti. ama de niño, ayo o aya, o tutor. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 116r. col. 1. Thanks to Joe Campbell for providing the transcription.