something that is made or raised in summer (see Molina)
Orthographic Variants:
xopantlacayotl
Alonso de Molina:
xupantlacayotl. cosa que se haze, o cria en verano. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 162r. col. 2. Thanks to Joe Campbell for providing the transcription.