A word appearing as N. rhind, rhinn “circle” in The Etymologies of the 1930s under the root ᴹ√RIN (Ety/RIN; EtyAC/RIN).
Neo-Sindarin: Many Neo-Sindarin writers adapt this word as ᴺS. rind “circle” for purposes of Neo-Sindarin as suggested in HSD (HSD), since the unvoicing of initial r to rh was a feature of Noldorin of the 1930s but not Sindarin of the 1950s and 60s. The final d is in keeping with the notion that “nd remained at the end of fully accented monosyllables” in Sindarin (LotR/1115).
Conceptual Development: Early Noldorin word-lists of the 1920s had ᴱN. rhim “ring, circle” derived from primitive ᴱ✶p’irimbe (PE13/152). The Gnomish Lexicon of the 1910s had G. rinc glossed “(aj.) circular. (n.) disc, rondure” (GL/65), probably based on the early root ᴱ√RINI having to do with circles (QL/80).
A more elaborate word for “circle” in The Etymologies of the 1930s, appearing as N. rhingorn as a combination of N. rhinn “circle” and N. corn “round” (Ety/KOR; RIN).
Neo-Sindarin: Many Neo-Sindarin writers adapt this word as ᴺS. ringorn “circle” for purposes of Neo-Sindarin as suggested in HSD (HSD), since the unvoicing of initial r to rh was a feature of Noldorin of the 1930s but not Sindarin of the 1950s and 60s.