tlallan.

Headword: 
tlallan.
Principal English Translation: 

in or under the ground

James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 236.

IPAspelling: 
tɬɑːllɑːn
Alonso de Molina: 

tlallan. debaxo la tierra.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 124r. col. 1. Thanks to Joe Campbell for providing the transcription.

Lockhart’s Nahuatl as Written: 

particle-like complex relational word. tlālli, -tlan. 236