breast cancer, or a very damaging cancer (see Molina)
Orthographic Variants:
uei qualocatl, huey qualocatl, huey cualocatl
Alonso de Molina:
uei qualocatl. çaratan o cancer pestifero. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 155v. col. 2. Thanks to Joe Campbell for providing the transcription.