April (see Molina); literally, the fourth month in a year
Orthographic Variants:
icnauhtetl metztli ycexiuitl
Alonso de Molina:
icnauhtetl metztli ycexiuitl. el mes de abril. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 33r. col. 1. Thanks to Joe Campbell for providing the transcription.