cuamanqui.

Headword: 
cuamanqui.
Principal English Translation: 

a figure or a shape that is wide at the top and narrow at the bottom (see Molina and Sahagún)

Orthographic Variants: 
quamanqui
Alonso de Molina: 

quamanqui. figura o cosa ahusada hazia baxo, y ancha en lo alto.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 85r. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

quamanqui = V-shaped (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), 111.