quetzontli.

Headword: 
quetzontli.
Principal English Translation: 

the long hair on the neck (see Molina)

IPAspelling: 
ketsontɬi
Alonso de Molina: 

quetzontli. pelos largos del cogote.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 89r. col. 2. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

quetzontli = longs cheveux sur l'occiput, sur le cou = long hair on the neck
See the Gran Diccionario Náhuatl, https://gdn.iib.unam.mx/diccionario/quetzontli/60934