A word for “twilight” used of the time near evening (LotR/1111). Since it followed the light, Tolkien said this was the “sad twilight”, an image or sign of the passing of beautiful things (NM/279). Its second element is ✶dōmē (NM/279), and its first element might be un(du) “down” referring to sunset; hat-tip to Parmandil for this suggestion.
Quenya
undómë
twilight
undómë
noun. twilight, time near evening
yualë
twilight
yualë noun "twilight" (KAL). Also yúcalë. Cf. yúyal.
yúcalë
twilight
yúcalë ("k")noun "twilight" (KAL, VT45:13). Also yualë.
yúyal
twilight
yúyal noun "twilight" (PE17:169); cf. yualë, yúcalë, q.v.
yúyal
noun. twilight
úyalë
noun. twilight
undómë noun "twilight", usually of the time near evening, not near dawn (that is tindómë)