pitzcoyonqui.

Headword: 
pitzcoyonqui.
IPAspelling: 
piːtskoyoːnki
Alonso de Molina: 

pitzcoyonqui. estrecha cosa desta manera.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 82v. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

PĪTZCOYŌNQUI something pierced, something with a narrow opening / estrecha cosa así como agujero o cosa semejante (M), agujerado (T) [(1)Tp.174]. Despite the vowel length discrepancy, this appears to be related to PITZĀHU(A) 'to make something thin.’ See PĪTZ-COYŌN(I).
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 198.