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Proto-Nahuan is the hypothetical daughter language of the Proto-Uto-Aztecan language which is the common ancestor from which the modern Nahuan languages have developed. Some phonological changes shared by all Nahuan languages are:
- Proto-Uto-Aztecan *t becomes Proto-Nahuan lateral affricate *t͡ɬ before Proto-Uto-Aztecan *a[1] ( PUA *ta:ka "man" becomes PN *tla:ka-tla "man" )
- Proto-Uto-Aztecan initial *p is lost in Proto-Nahuan.[2] (PUA *pahi "water" becomes PN *a:-tla "water")
- Proto-Uto-Aztecan *u merges with *i into Proto-Nahuan *i[3] (PUA *muki "to die" becomes PN *miki "to die)
- Proto-Uto-Aztecan sibilants *ts and *s split into *ts, *ch and *s, *ʃ respectively.[4]
- Proto-Uto-Aztecan fifth vowel reconstructed as *ɨ or *ə merged with *e into Proto-Nahuan *e[5] (PUA *nɨmi "to walk" becomes PN *nemi "to live, to walk")
- a large number of metatheses in which Proto-Uto-Aztecan roots of the shape *CVCV have become *VCCV.[6] (PUA *pu:li "to tie" becomes PN *ilpi "to tie" )
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- ^ Dakin (1982), pp. 25, 67-8
- ^ Voegelin, Voegelin & Hale (1962)
- ^ Langacker (1977), p. 23
- ^ Dakin (1982), p. 51-62
- ^ Langacker (1977), p. 23
- ^ Dakin (1982), p. 62-3