Sindarin Phonetic Development (Part 88)

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S. middle consonants frequently vanished in clusters; [CCC] > [CC]

This rule is a placeholder for a host of complex Sandhi changes (changes at morpheme boundaries in compounds) that I don’t want to examine in detail right now. David Salo examined these sound changes in detail in Gateway to Sindarin (GS/51-59), and this remains the best description of these phonetic developments.

Sindarin Phonetic Development (Part 85)

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S. [ī], [ū] often shortened in polysyllables; [ī|ū] > [ĭ|ŭ]

Just as long vowels shortened before clusters, it seems that in both Sindarin and Noldorin the long vowels [ī], [ū] often shortened in polysyllables, as noted by David Salo (§4.166). Tolkien mentioned this phonetic development in his notes on the Noldorin usage of the Feanorian Alphabet from the 1930s: