an dried ear of corn, or something similar (see Molina)
IPAspelling:
semoːloːtɬ
Alonso de Molina:
cemolotl. vna mazorca de mayz, o cosa semejante. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 16v. col. 1. Thanks to Joe Campbell for providing the transcription.