mintontli.

Headword: 
mintontli.
Principal English Translation: 

great-great-grandparent
Digital Florentine Codex, Book 10, f. 4v. https://florentinecodex.getty.edu/book/10/folio/4v

IPAspelling: 
mintoːntɬi
Alonso de Molina: 

mintontli. hermano de tercero abuelo, o nieto de tercero, o nieta de tercera.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 56v. col. 2. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

mintontli = "Great-great-grandfather and great-great-grandmother: Their bodies and heads tremble. They are always coughing. They totter because they are weak. They have reached the end of old age. A good great-great-grandfather or great-great-grandmother takes the place of his or her descendants’ father and mother. They are like a precious root or foundation."
Digital Florentine Codex, Book 10, f. 4v. https://florentinecodex.getty.edu/book/10/folio/4v. (León García-Garagarza, Spanish-to-English translation, 2023.)

mintontli = great-grandfather
Fray Bernardino de Sahagún, Prímeros Memoríales, ed. Thelma D. Sullivan (Norman: University of Oklahoma Press, 1997), 251.