to scatter, to glisten, to reflect (reflexive verb) (see Molina and Karttunen)
IPAspelling:
petɬɑːni
Alonso de Molina:
petlani. (pret. opetlan.) derramarse alguna cosa liquida. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 81r. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
PETLĀN(I) for something to scatter, glisten, reflect / derramarse alguna cosa líquida (M), derramarse algo y relumbrar (C), brilla, reluce, relumbra (T). Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 192.