tlatzacualoni.

Headword: 
tlatzacualoni.
Principal English Translation: 

lock, latch (closer)
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), 239.

Orthographic Variants: 
tlatzaqualoni
Alonso de Molina: 

tlatzaqualoni. cerradura o cosa semejante para cerrar o atapar algo.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 142v. col. 1. Thanks to Joe Campbell for providing the transcription.

Lockhart’s Nahuatl as Written: 

instrumental noun from tzaqua.
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), 239.