S. duin n. “(large) river” (Category: Brook, Stream, River)
A Sindarin word for river, more specifically a large one (LotR/1138; PM/54; RC/765; VT48/24), derived from primitive ✶duinē and the root √DUY “flow (strongly), flood, inundate” (RC/766; VT48/23-24).
Conceptual Development: The first precursor to this word seems to be G. duif “stream” from the Gnomish Lexicon of the 1910s, derived from primitive ᴱ✶duiwe and related to G. duil “flight” (GL/31). The Etymologies of the 1930s had N. duin under the root ᴹ√DUI̯, but there it was a loan word from Ilk. duin “water, river”. After Tolkien abandoned Ilkorin, it became a native Sindarin word.
References ✧ LotR/1138; PM/54; RC/765; S/123; SA/duin; VT48/24, 30; WJ/191
|Duinath||nasal-mutation class-plural; d-mutation||“rivers”||✧ S/123|
|✶duinē > duin||[duinē] > [duine] > [duin]||✧ RC/765|
|✶duini > duin||[duini] > [duine] > [duin]||✧ VT48/24|
N. duin n. “water, river” (Category: Brook, Stream, River)
Reference ✧ EtyAC/DUI ✧ “water, river”
|Ilk. duin > duin||[duin]||✧ EtyAC/DUI|
G. duif (duiv-) n. “stream” (Category: Brook, Stream, River)
References ✧ GL/31
|ᴱ✶duiwe > duif||[duiwe] > [duive] > [duiv]||✧ GL/31|