a clinic or hospital (see Molina); literally, sick-house
Alonso de Molina:
cocoxcacalli. enfermeria o hospital. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 24r. col. 1. Thanks to Joe Campbell for providing the transcription.