iztaya.

Headword: 
iztaya.
Principal English Translation: 

for something to end up white (verb); or, to whiten something from afar (verb); or, tin (noun)

Orthographic Variants: 
ystaya
IPAspelling: 
istɑyɑ
Alonso de Molina: 

iztaya. pararse blanca alguna cosa, o blanquear algo de lexos.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 49r. col. 2. Thanks to Joe Campbell for providing the transcription.

iztaya. n. (pret. oniztaz. vel. oniztayac.) pararse blanco.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 49r. col. 2. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

IZTAY(A) pret: IZTAZ-IZTAYAC for something to turn white, to appear white because of being at a distance / pararse blanca alguna cosa, o blanquear algo de lejos (M), pararse blanco (M) [(4)Cf. 32V, 93r]. See IZTA-TL.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 124.

Attestations from sources in English: 

çentetl ystaya plato yhuan çentetl yscouila no ystaya = a plate made of tin and a bowl (or, brush) of his, also of tin (n.d., sixteenth century)
Testaments of Culhuacan (provisionally modified first edition), eds. Sarah Cline and Miguel León-Portilla, online version http://www.history.ucsb.edu/cline/testaments_of_culhuacan.pdf, 13.