Another name for Herendil in Tolkien’s unfinished story “The Lost Road”, translated “Slender and Dark” (LR/59). In The Etymologies, the name was glossed “slender-dark” given as a compound of teren “slender” and the root ᴹ√(N)DUL, which had derivatives such as nulla “dark” (Ety/DUL, NDUL, TER).
Quenya
Terendul
slender-(and)-dark
Terendul masc. name "Slender-(and)-dark" (LR:59, TER/TERES, DUL, NDUL)