thon

root. *pine

The unglossed root ᴹ√THON appeared in The Etymologies of the 1930s with derivatives Ilk. thōn and N. thaun “pine-tree” (Ety/THOL); according to Hostetter and Wynne, Christopher Tolkien incorrectly recorded this root as ᴹ√THŌN, but that was actually just the Ilkorin form of the word. Tolkien explained the somewhat unusual Noldorin form N. thaun as the result of a loan for Ilk thōn, with the Noldorin word being adapted as ō [ǭ] < [primitive] ā; this loan must have occurred in the period after [[on|ancient long [ō] became [ū]]] in Old Noldorin, but before [[n|[ǭ] (from [ā]) became [au]]]. This 1930s root was used mainly to explain the name Ilk. Dorthonion “Land of Pines”.

In a 1955 letter to David Masson, Tolkien derived S. thôn “pine” from ✶stŏna (PE17/82). However, in Words, Phrases and Passages from the Lord of the Rings written in the late 1950s or early 1960s Tolkien derived this element of S. Dorthonion from {stāna >> thānĭ >>} thŏno, apparently coming full circle back to the 1930s root √THON (PE17/81).

lath

root. string, thong

A root in The Etymologies of the 1930s glossed “string, thong”, with derivatives like ᴹQ. latta “strap” and N. lhath “thong of (?leather)”, the last gloss being somewhat unclear (Ety/LATH).

mālō

noun. friend

yel

root. friend

A new gloss for the root ᴹ√YEL “daughter”, with a new set of derivatives like ᴹQ. -iel “-friend” and ᴹQ. yelda “friendly” (Ety/YEL), but it was rejected in turn and probably replaced by ᴹ√MEL.