through the use of (or with) iron weapons (see Molina)
Orthographic Variants:
tepuztlauiztica, tepuztlahuiztica
Alonso de Molina:
tepuztlauiztica. con armas de hierro. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 104v. col. 1. Thanks to Joe Campbell for providing the transcription.