the white core or heart of the maguey (an agave plant) before it is cut (see Molina)
IPAspelling:
mestɑlloːtɬ
Alonso de Molina:
meztallotl. cogollo blanco de maguei antesque eche tallo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 55v. col. 2. Thanks to Joe Campbell for providing the transcription.