mazamachtiani.

Headword: 
mazamachtiani.
Principal English Translation: 

horse-breaker (mostly colts) (see Molina); note the "deer" (mazatl) element in this terminology, which is a reminder of how Nahuas originally saw horses when they were reintroduced into this hemisphere by the invading Spaniards (SW)

Alonso de Molina: 

mazamachtiani. domador de potros.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 50r. col. 2. Thanks to Joe Campbell for providing the transcription.