chiahuac.

Headword: 
chiahuac.
Principal English Translation: 

something oily, stained

Orthographic Variants: 
chiauac
Alonso de Molina: 

chiauac. cosa grasienta.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 19r. col. 2. Thanks to Joe Campbell for providing the transcription.