See also the preposition ned , and the noun ened for a discussion of this form
Noldorin
nedh-
prefix. mid-
nedh-
prefix. in, inside, mid-
ne-
prefix. in
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.
di
preposition. in
nîdh
noun. honeycomb
nîdh
noun. honeycomb
A prefix for “mid-” in The Etymologies of the 1930s under the root ᴹ√NED (Ety/NÉD).