A noun lóna glossed “pool, mere” derived from the root √LON and distinct in origin from Sindarin lô “flood” < √LOG (VT42/10).
Conceptual Development: This word seems to be a remnant of Tolkien’s investigation into the origin of the river-name S. Lhûn (PE17/136-137; VT48/27-28), where Tolkien first considered having a related Quenya word hlōna “a river” (PE17/136), then another related word lōn(e) “deep pool or lake” (PE17/137), but this notion was rejected and Tolkien said:
> The stem (S)LOW- does not appear in Quenya, where it is replaced by √LŎNŎ, as in lōn/lōne (pl. lōni) “deep pool or river-feeding well” (PE17/137).
This word and its derivation seems to have reemerged as lóna “pool, mere” in the notes on The Rivers and Beacon-hills of Gondor from the late 1960s, as described above (VT42/10).
[luina] adj. "pale" (VT45:30)