Investigating internal ways of lexicon expansion in early PIE

The focus of this paper lies on IE roots which, though considered primary in the daughter languages, show evidence to suggest that their morphological structure as well as their meaning are not primary but derived . These are the so-called extended roots . The author offers some observations on the nature of the last radical in verbal roots ending in *°bh in postconsonantal position (consonantal glides included) . Speculative cases left aside, several groups come into consideration, depending on the origin of the root-final *°bh . It is argued that while certain extended roots hark back to former univerbations of syntagmas with the light intransitive verb IE *bhu̯eh2‘become, turn’ as the second component, several others contain a semantically weakened deictic element IE *bhi-, and a third group strongly suggests a *bh° formative with former causative semantics/function. Finally, the author touches upon several isolated cases of root variation and/or parallel extension with *bh and offers a tentative analysis of the derivation processes involved .