pitzahuac.

Headword: 
pitzahuac.
Principal English Translation: 

something thin, slender (see Karttunen and Molina); staves, pillars, columns; or, the road; or, a thin and subtle wind; small beans, small lentils, and the like (see Molina); might the small beans also refer to cacao, and therefore to money? (see IDIEZ for the other pitzāhuac that refers to change, money)

Orthographic Variants: 
pitzauac, pitzaoac
IPAspelling: 
pitsɑːwɑk
Alonso de Molina: 

pitzauac. cosa delgada, assi como varas, pilares, colunas, sogas y cosas largas y rollizas, o el camino, el viento delgado y sotil, los frisoles pequeños, lantejas, o cosas semejantes.
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: 

PITZĀHUAC something thin, slender / cosa delgada, así como varas, pilares, columnas, sogares, y cosas largas y rollizas, o el camino, el viento delgado y sutil, los frijoles pequeños, lentejas, o cosas semejantes (M) This implies intransitive PITZĀHUA 'to get thin' and transitive PITZĀHU(A) 'to make something thin.' See PITZĀHU(I).
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 197.

Attestations from sources in English: 

auh ce pitzaoac om jcxi yiopochcopa, qujpotonj in jxocpal, yoan qujtexooaoan in jmetz vmexti. yoan vmexti in jacol = And on his one thin foot, his left, he had the sole pasted with feathers, and he had stained both of his thighs with blue mineral earth, and both upper arms (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 3 -- The Origin of the Gods, Part IV, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1978), 4.

pitzaoac = thin (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 10 -- The People, No. 14, Part 11, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 132.

themes: 
Architecture, Construction, Buildings
Food, Eating, Cooking
Money, Coins, Wealth