amacopilli.

Headword: 
amacopilli.
Principal English Translation: 

a cone made of paper, usually worn on the head (see Molina and attestations)

IPAspelling: 
ɑːmɑkopilli
Alonso de Molina: 

amacopilli. coroza de papel.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 4r. col. 2. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in Spanish: 

penacho cónico hecho de papel
Diego G. López Rosado, Historia y pensamiento económico de México (1968), 138.

themes: 
Paper