mamaztli.

Headword: 
mamaztli.
Principal English Translation: 

a soft feather used in weaving and other projects

IPAspelling: 
mɑmɑstɬi
Alonso de Molina: 

mamaztli. cañon con pluma.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 52r. col. 1. Thanks to Joe Campbell for providing the transcription.