chilmalacatl. cierta yerua grande y redonda. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 21r. col. 1. Thanks to Joe Campbell for providing the transcription.
Attestations from sources in English:
At the root: chile and malacate. The plant must resemble a spindle.