hyyac.

Headword: 
hyyac.
Principal English Translation: 

something that stinks (see Molina)

Orthographic Variants: 
hiyac, hiiac, iiac
Alonso de Molina: 

hyyac. cosa hedionda.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 30r. col. 1. Thanks to Joe Campbell for providing the transcription.