Sindarin Phonetic Development (Part 23)

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OS. [z] vanished before [d] lengthening preceding vowel; [Vzd] > [V̄d]

In Sindarin and Noldorin, [z] disappeared before the voiced stop [d], modifying the preceding vowel, though the exact phonetic rules evolved between the conceptual stages of the language. For Sindarin, this change is described in a couple places within notes on the Outline of Phonology [OP2] from around 1950:

Sindarin Phonetic Development (Part 22)

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OS. long final vowels were shortened; [-SV̄] > [-SV̆]

Primitive Elvish words often ended in long vowels, but in (Old) Sindarin these vowel were shortened in polysyllables, and later still, these short final vowels vanished. The evidence for these sound changes is so ubiquitous that it is not a question of whether these changes occurred, but when.

Sindarin Phonetic Development (Part 20)

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OS. final [tʰ] became [t]; [-tʰ] > [-t]

Based on a single example, it seems final [-tʰ] > [-t], probably in Old Noldorin, as suggested by David Salo (GS/§4.55):

  • ᴹ✶KHOTH [> khōth > khōt] > N. hûd “assembly” (Ety/KHOTH).

It is unclear whether this sound change applied to other final aspirates, or whether this change could also occur in later Sindarin.