ehuatlapitzalhuehuetl.

Headword: 
ehuatlapitzalhuehuetl.
Principal English Translation: 

an organ (a musical instrument) (see Molina); the elements seem to be leather, flute/pipes, and percussion/drum

Orthographic Variants: 
euatlapitzalhueuetl
IPAspelling: 
eːwɑtɬɑpiːtsɑlweːweːtɬ
Alonso de Molina: 

euatlapitzalhueuetl. organo.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 29v. col. 1. Thanks to Joe Campbell for providing the transcription.