tepotzocuallotl.

Headword: 
tepotzocuallotl.
Principal English Translation: 

rust (see Molina)

Orthographic Variants: 
tepoxocuallotl, tepuxoquallotl, tepoxoquallotl
Alonso de Molina: 

tepuxoquallotl. herrumbre.
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.