A noun meaning “(small) bird” (SA/lin¹, Ety/AIWĒ), appearing in the name Linaewen “Lake of Birds” (S/119, UT/401). It was derived from primitive ᴹ✶aiwē like its Quenta cognate aiwë (Ety/AIWĒ), with the primitive diphthong [ai] becoming the [ae] in Sindarin.
Conceptual Development: In the Gnomish Lexicon from the 1910s, G. aigli “bird” was given as a derivative of the root ᴱ√aı̯² (GL/17). In Early Noldorin notes from the 1920s, it became ᴱN. aiw “bird” (PE13/136, 158). In The Etymologies from the 1930s, the form became N. aew “(small) bird” (Ety/AIWĒ), and this is the source of the derivation given above.