amoxtlatolpehualiztli.

Headword: 
amoxtlatolpehualiztli.
Principal English Translation: 

the beginning of a book (see Molina); from amoxtli, books, tlahtolli (or, more common in early Nahuatl, tlatolli), words, and pehua, to begin

Orthographic Variants: 
amoxtlahtolpehualiztli, amox tlatolpeualiztli, amox tlatolpehualiztli
Alonso de Molina: 

amox tlatolpeualiztli. argumento, o principio de libro.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 5v. col. 2. Thanks to Joe Campbell for providing the transcription.