cuatzontli.

Headword: 
cuatzontli.
Principal English Translation: 

head hair (as contrasted with body hair) (see Karttunen); can also be hair that hangs over the forehead, such as bangs (see Molina's second example); also, can be another name for the tzontli, a wrapped lock of hair worn by priests and warriors; finally, it can be the hair that lands on the neck when a boy has his hair cut (see the Gran Diccionario Náhuatl)

Orthographic Variants: 
cuātzontli
IPAspelling: 
kwɑːtsontɬi
Alonso de Molina: 

quatzontli. cabellos, o pelos dela cabeza.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 86r. col. 1. Thanks to Joe Campbell for providing the transcription.
quatzuntli. cabellos que cuelgan sobre la frente.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 86r. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

CUĀTZON-TLI head hair (as contrasted with body hair) / cabellos, o pelos de la cabeza (M) [(3)Tp.148]. This is attested as an element of the construction CUĀTZONĀHUIĀ. See CUĀ(I)-TL, TZON-TLI.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 71.