See also the preposition ned , and the noun ened for a discussion of this form
Noldorin
ne-
prefix. in
nedh-
prefix. in, inside, mid-
nedh-
prefix. mid-
A prefix for “mid-” in The Etymologies of the 1930s under the root ᴹ√NED (Ety/NÉD).
nestag-
verb. to insert, stick in
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).
callon
noun. hero
callon
noun. hero
di
preposition. in
ia
adverb. ago
io
adverb. ago
io
adverb. ago
lheben
cardinal. five
lheben
cardinal. five
men
pronoun. us
poen
noun. small gull, petrel
thalion
noun. hero, dauntless man (especially as surname of Húrin Thalion)
thoron
noun. eagle
thoron
noun. eagle
thôr
noun. eagle
thôr
noun. eagle
A prefix for “in” implied by the verb N. nestag- “insert” from The Etymologies of the 1930s (Ety/STAK). It was probably derived from primitive ᴹ✶ndē̆- “in, inside” based on the root ᴹ√NĒ̆, but this root and its derivatives were deleted (EtyAC/NĒ̆).
Neo-Sindarin: Despite the deletion of its root, I think it is worth retaining ne- “in” for purposes of Neo-Sindarin.