milk skin, or wine flower (see Molina; partly a loan word, huino = vino = wine)
Orthographic Variants:
iyxpoxcauhca yn uino
Alonso de Molina:
iyxpoxcauhca yn uino. nata, o flor de vino. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 37r. col. 2. Thanks to Joe Campbell for providing the transcription.