a person who waters, or a humble worker (see Molina)
Alonso de Molina:
atlacuic. aguador o azacan. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 8r. col. 2. Thanks to Joe Campbell for providing the transcription.