the heart or core of the maguey plant (an agave) (see Molina)
IPAspelling:
metɑloːtɬ
Alonso de Molina:
metalotl. meollo de maguei. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 55v. col. 1. Thanks to Joe Campbell for providing the transcription.