something that becomes rotted, putrid (see Molina)
IPAspelling:
pɑlɑːnini
Alonso de Molina:
palanini. cosaque se pudre, o podrece. 71m2-79r. col. 2. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. Thanks to Joe Campbell for providing the transcription.