greenness or lushness, freshness of the meadow (see Molina)
Alonso de Molina:
xiuhcaltiliztli. verdor o frescura de prado. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 159v. col. 2. Thanks to Joe Campbell for providing the transcription.