zanyeicay.

Headword: 
zanyeicay.
Principal English Translation: 

then, when, at that time

Orthographic Variants: 
zanyeicay, çanyeicay, çan yeicay
Alonso de Molina: 

zanyeicay. luego ala hora. (aduerbio.)
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 14r. col. 2. Thanks to Joe Campbell for providing the transcription.