cuaxicalli.

Headword: 
cuaxicalli.
Principal English Translation: 

skull

IPAspelling: 
kwɑːʃiːkɑlli
Frances Karttunen: 

CUĀXĪCAL-LI skull, cranium / casco de la cabeza, o calavera (M) [(2)Tp.123,129,(3)Zp.24,96,148]. See CUĀ(I)-TL, XĪCAL-LI.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 67.

Attestations from sources in English: 

toquaxical = Our skull (central Mexico, sixteenth century)
Fray Bernardino de Sahagún, Primeros Memoriales, ed. Thelma D. Sullivan, et al. (Norman: University of Oklahoma Press, 1997), 257.