A verb in The Etymologies of the 1930s appearing in its Noldorin-style infinitive form nestegi “insert, stick in”, derived from ON. nestak- under the root ᴹ√STAK “split, insert” (Ety/STAK). As such, its unmutated stem would be ✱nestag-. Its initial prefix ne- is derived from ᴹ✶ndē̆- “in, inside” under the (deleted) root ᴹ√NĒ̆ (EtyAC/NĒ̆).
Noldorin
ne-
prefix. in
nedh-
prefix. in, inside, mid-
nestag-
verb. to insert, stick in
callon
noun. hero
callon
noun. hero
di
preposition. in
thalion
noun. hero, dauntless man (especially as surname of Húrin Thalion)
See also the preposition ned , and the noun ened for a discussion of this form