something on the east or of the east, eastern (see Molina)
Orthographic Variants:
tonatiuh yxcopa uitz
Alonso de Molina:
tonatiuh yxcopa uitz. cosa oriental o de leuante. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 149v. col. 2. Thanks to Joe Campbell for providing the transcription.