Thread:User talk:CodeCat/Proto-Indo-European/reply (19)

Roots can't end in vowels, so *dʰre- is not a root. There is something called 'root extension' where a consonant (not a vowel!) is added onto another root, but I don't really know how that works.

Which words meaning king and queen descend from it?

Kluge's law describes a sound change that occurred in the history of Germanic. It is not convincingly accepted by linguists but there is still some evidence that seems hard to ignore. The change meant that a sequence of any PIE plosive (voiceless, voiced or aspirated) followed by n was converted into a geminate (double) voiceless plosive. For 'rock', the sequence of events according to Kluge's law could be roughly as follows: h₃ruknéh₂- > ruknā- > (by Kluge's law) rukkā- > rukkō- (infinitive *rukkōną).