A Doriathrin noun for “fog” written hiðum in The Etymologies, and derived from the primitive form ᴹ✶khithme [kʰitʰme] (Ety/KHIS, EtyAC/KHIS). This word illustrates several interesting phonetic changes in Ilkorin.
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Both the aspirates became voiceless spirants: [kʰ-] > [x-] and [-tʰ-] > [-θ-].
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Later the [[ilk|initial [x-] became [h-]]].
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Meanwhile the [[ilk|medial [-θ-] voiced to [-ð-]]] (“dh”).
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The [[ilk|primitive final [e] was lost]].
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Afterwards, the resulting [[ilk|final [m] became syllabic and developed into [-um]]].
A noun for “smoke” developed from primitive ᴹ✶us(u)kwē (Ety/USUK). In this example, the loss of the second [u] was probably very early, since it appears in all child languages. This word is a good example of how [[ilk|[w] vanished after medial velars]] in Ilkorin, as noted by Helge Fauskanger (AL-Ilkorin/usc).