A verb for “conceal” in The Etymologies of the 1930s under the root ᴹ√DUL “hide, conceal” (Ety/DUL).
Noldorin
delia-
verb. to conceal
delia-
verb. to conceal
telia-
verb. to play
teilia-
verb. to play
doltha-
verb. to conceal
doltha-
verb. to conceal
ganna-
verb. to play a harp
gannada-
verb. to play a harp
A verb appearing as dœlio > delio “conceal” in The Etymologies of the 1930s under the root ᴹ√DUL “hide, conceal” (Ety/DUL; EtyAC/DUL). Its modern form indicates that first short *u* > *o*, and then this *o* underwent *i*-affection > *œ* > *e*.
Neo-Sindarin: These phonological developments may present some problems with Tolkien’s later ideas of how *u* > *o* in Sindarin. To avoid those complications, I recommend using N. doltha- “conceal” instead.