Middle Primitive Elvish
den
root. hole, gap, passage
ab
root. refuse, deny, say no; away, go away, depart
pen(ed)
root. *hillside, slope
ndanithārō
masculine name. Saviour of the Dani
skelta-
verb. to strip
(n)dak
root. slay
dak
root. slay
danta-
verb. fall
tundu
noun. hole
A (Noldorin-only?) root in The Etymologies of the 1930s glossed “hole, gap, passage” with the derivative dîn “opening, gap, pass in mountains” (< ✱dēnǝ) which is an element in a couple names from The Etymologies but appearing nowhere else (Ety/DEN).