Doriathrin
tindum
noun. (starry) twilight, starlight, starlight, twilight, starry twilight
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A noun meaning “(starry) twilight, starlight”, a combination of tim “star” and dûm “twilight” (Ety/DOMO, TIN), also appearing in its genitive form tinduma (Ety/THIN). Either the compound preserved the original [n] from tim < ᴹ✶tinmē, or the [n] reformed by assimilation to the [d].