a certain small animal, such as a rat (see Molina)
Orthographic Variants:
atuçan, atuzan
Alonso de Molina:
atuzan. cierto animalejo como rata. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 9r. col. 1. Thanks to Joe Campbell for providing the transcription.