a pad that goes on one's head, under something else that will be worn or carried on the head (see Molina)
Orthographic Variants:
quayaualli, quayahualli
Alonso de Molina:
quayaualli. rodilla, o cosa semejante que ponen enla cabeza para lleuar algo sobre ella. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 84r. col. 2. Thanks to Joe Campbell for providing the transcription.