nan (“vally, grassland”) + dú (“nightfall, dimness”) + sîr (“river”) + ion (pl. genitive suffix)
Sindarin
nanduhirion
place name. Dimrill Dale, (lit.) Vale of (the Region of) Dim Streams
Nanduhirion
noun. valley of dim streams
Nanduhirion
'Vale of Dim Streams'
topon. 'Vale of Dim Streams', Dimrill Dale. Dw. Azanul-bizar.
Nanduhirion
Nanduhirion
Nanduhirion contains the elements nan(d) ("vale"), dû ("dimness"), sîr ("stream") and the ending -(i)on.
A valley in the Misty Mountains translated “Dimrill Dale” (LotR/283) or more literally “Vale of (the Region of) Dim Streams” (RC/269, PE17/37). It is itself a translation of Kh. Azanulbizar of similar meaning (LotR/283, TI/166, PE17/35). This name is a combination of nan(d) “valley”, dû “night, dimness”, the lenited form hir of sîr “river, stream”, and the suffix -ion “-region, -land” (PE17/37).
Conceptual Development: In Lord of the Rings drafts from the 1940s, this valley was first named N. Tum Dincelon “Dimrill Dale” (RS/434), later revised to N. Nanduhiriath (TI/174) and finally N. Nanduhirion (TI/166).