A “root” (more likely just a primitive word) appearing in The Etymologies of the 1930s as the basic for the words ᴹQ. aiwe, N. aew “small bird” (Ety/AIWĒ). A precursor ᴱ√aı̯ to this root appeared in the Gnomish Lexicon of the 1910s with derivatives ᴱQ. aiwe, G. aigli “bird” (GL/17). The continued appearance of Q. aiwë (UT/401) and S. aew (S/119) in later writings strongly indicates this primitive form remained valid in Tolkien’s later writings.
root. (small) bird