zantlaco.

Headword: 
zantlaco.
Principal English Translation: 

something medium-sized, between large and small

Orthographic Variants: 
zantlaco, çantlaco, çan tlaco
Alonso de Molina: 

zantlaco. cosa mediana, entre grande y chica.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 14v. col. 2. Thanks to Joe Campbell for providing the transcription.