a snake or serpent that lives in the water trough of pigs or horses (see Molina)
Orthographic Variants:
tzuncoatl
Alonso de Molina:
tzuncoatl. culebra que se cria enel agua de cerdas de cauallo, o de cosa semejante. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 154r. col. 2. Thanks to Joe Campbell for providing the transcription.