Deglottalizing contamination in A'ingae historical derivatives

I describe and analyze the phonological form and historical trajectory of nominal derivatives in A’ingae (ISO 639-3: con), an underdocumented Amazonian isolate. Some words historically derived with otherwise preglottalized nominalizers have no glottalization today. I propose that these “exceptions” are reflexes of originally glottalized words, which underwent semantic shift and lost glottalization due to contamination from the plain (i.e. non-glottalized) majority. The paper thus documents a rare case where non-productive morphological patterns are the innovation, not retention.