a thicket, or a large clump of branched vegetation (see Molina)
Orthographic Variants:
tlaltetzmulli
Alonso de Molina:
tlaltetzmulli. breña, o mata grande de ramon. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 124v. col. 2. Thanks to Joe Campbell for providing the transcription.