ᴹ√NAS root. “point, sharp end”
A root in The Etymologies of the 1930s glossed “point, sharp end”, with derivatives like ᴹQ. nasse “thorn, spike”, N. nass “point, (sharp) end; angle, corner” and ᴹQ. nasta-/N. nasta- “to prick” (Ety/NAS). It also had an s-prefixed variant ᴹ√SNAS or ᴹ√SNAT whose most notable derivative was N. naith “gore” (Ety/SNAS). Tolkien used the name S. Naith for the wedge of land in Lórien between the rivers Celebrant and Anduin in The Lord of the Rings (LotR/347).
The derivation of N. naith from ᴹ√SNAS/SNAT is unclear, however, and later on Tolkien gave a new etymlogy of this word from the root √NEK¹ “narrow” (PE17/55; UT/282). This may mean Tolkien abandoned ᴹ√(S)NAS, but I think it is worth retaining ᴹ√NAS for purposes of Neo-Eldarin for words like nasta- “to prick”.
References ✧ Ety/BEN, NAS, SNAS