A word in The Etymologies of the 1930s glossed “large” derived from the root ᴹ√UR “wide, large, great”, itself a revision of ᴹ√UR “be hot” (Ety/UR).
Neo-Quenya: Since √UR “heat” was restored in Tolkien’s later writings, I would not use the adjective úra for “large”.
Another name of the “Great Sea” (N. Belegoer) appearing in The Etymologies from the 1930s as compound of alta “great (in size)” and aire “sea” (Ety/ÁLAT, AY).