ᴹ√TIW root. “fat, thick”
The root ᴹ√TIW “fat, thick” appeared in The Etymologies of the 1930s with derivatives like ᴹQ. tiuka/N. tûg “thick, fat” and ᴹQ. tiuko “thigh” (Ety/TIW). Tolkien said it may have been the basis for the root ᴹ√TUY “spring, sprout” via the sense “grow fat, swell” (Ety/TUY), perhaps as an abnormal vocalization: *tiwy- > *t(i)u̯y-. Tolkien had a similar pair of related roots in the Qenya Lexicon of the 1910s: ᴱ√TIW̯I “thick” and unglossed ᴱ√TYU which was the basis for words like ᴱQ. tyû “thigh” (GL/50, 93); that document also had ᴱ√TUẎU as the basis for “sprout” and “spring” words, but in the 1910s it seems to be unrelated. Also in the 1910s, Tolkien had unglossed ᴱ√PIẆI with derivatives like ᴱQ. pingwa “fat, rich (of soil)” and ᴱQ. piu “calf of leg” (QL/74), which might have been another precursor to ᴹ√TIW “fat, thick” from the 1930s.
In the Outline of Phonetic Development (OP1) also of the 1930s, Tolkien instead gave ᴹ√KIWIK as the basis for ᴹQ. ciuca “thigh” (PE19/54). A similar etymology for Q. kiuka or kyūka “thigh” appeared in Outline of Phonology (OP2) of the early 1950s (PE19/107). Thus there was considerable variation in form for these roots.
Neo-Eldarin: For purposes of Neo-Eldarin, I’d stick with ᴹ√TIW “fat, thick” as the base root, as it has the largest collection of derivatives.
References ✧ Ety/TIW; EtyAC/TUY
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ᴱ√PIẆI root. “*fat”
References ✧ QL/74
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ᴱ√TIW̯I root. “thick”
References ✧ QL/50, 93
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