S. ethir¹ n. “mouth of a river, (lit.) outflow” (Category: Brook, Stream, River)
A noun for the mouth of a river or a river delta, glossed “outflow” in the Unfinished Index of The Lord of the Rings (RC/350; Ety/ET). It was a combination of primitive ✶et “out” and S. sîr “river” (SA/sîr; Ety/ET), where ts > th.
Conceptual Development: The word and its derivation first appeared as N. ethir in The Etymologies of the 1930s (Ety/ET).
References ✧ LotRI/Anduin; RC/350; SA/sîr
|ed¹||“out, out of”|
|sîr||“river, stream”||✧ SA/sîr|
|✶et||“out (of), forth”||✧ SA/sîr|
Reference ✧ Ety/ET ✧ “mouth of a river”
|ᴹ✶etsiri > ethir||[etsiri] > [eθθiri] > [eθθir] > [eθir]||✧ Ety/ET|
Reference ✧ LR/407 ✧ Eges “mouths”