a southwest wind, or a wind that brings the rain (see Molina)
Orthographic Variants:
quiauhyo ehecatl
Alonso de Molina:
quiauhyo ehecatl. ayre o viento abrego, o que trae lluuia. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 89v. col. 1. Thanks to Joe Campbell for providing the transcription.