the Adam's apple (see Molina); see also cocoxittontli
Alonso de Molina:
cocoxixipochtli. nuez dela garganta. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 24r. col. 1. Thanks to Joe Campbell for providing the transcription.