a state of being very thin and bony, or the process of becoming thin and bony (see Molina)
Alonso de Molina:
oomitiliztli. flaqueza desta manera, o enflaquecimiento tal. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 77v. col. 1. Thanks to Joe Campbell for providing the transcription.