metztli.

Headword: 
metztli.
Principal English Translation: 

leg of a person or of an animal (see Molina)

IPAspelling: 
metstɬi
Alonso de Molina: 

metztli. luna, o pierna de hombre o de animal, o mes.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 55v. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

in quauhtli imetz = the legs of the eagle (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 2 -- The Ceremonies, no. 14, Part III, 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, 1951), 88.

in jmetzpan qujtlatlaliticatca: auh in jmemeialotzin, quemeca ic oqujmotetzaujli = the one who had placed him on her thigh, the one who with her milk had indeed strengthened him (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, 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), 12.vmpa conana, ynic qujujca ichan, ynjc qujquazque: vmpa qujxexeloa, qujtetequj, qujueueloa: oc ie achto qujtonaltia in motecuçuma ce ymetz, mantiuh in qujujqujlia = There they took [the slain captive] up, in order to carry him to the house [of the captor], so that they might eat him. There they portioned him out, cutting him to pieces and dividing him up. First of all they reserved for Moctezumna a thigh, and set forth to take it to him. (16th century, Mexico City)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 2—The Ceremonies, No. 14, Part III, 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, 1951), 47.