a heavy flow or spilling of blood; a rain of blood (see Molina)
Orthographic Variants:
exaxauanilizlli
Alonso de Molina:
exaxauaniliztli. sangre lluuia. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 29v. col. 1. Thanks to Joe Campbell for providing the transcription.