a bell tower (see Molina); the place where the metal hangs [i.e. bells hang]
Orthographic Variants:
tepuztli pilcayan
Alonso de Molina:
tepuztli pilcayan. campanario. 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.