a thin metal, paper-like; tinplate? corrugated iron? (see Molina)
Orthographic Variants:
tepuz amatl
Alonso de Molina:
tepuz amatl. hoja de milan, o cosa semejante. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 103v. col. 2. Thanks to Joe Campbell for providing the transcription.