a tree grafter, something that binds a part from one tree onto another (see Molina)
Orthographic Variants:
quauhzalo
Alonso de Molina:
quauhzalo. enxertador de arboles. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 86r. col. 2. Thanks to Joe Campbell for providing the transcription.