N. gwilith n. “air (as a region)” (Category: Air, Ether)
An abstract noun in The Etymologies of the 1930s glossed “air as a region” under the root ᴹ√WIL (Ety/WIL). In other words, you breath N. gwelw (ᴺS. gwelu) “air as a substance”, but birds fly through gwilith, basically making it the lower sky below the clouds.
Conceptual Development: In Gnomish Lexicon of the 1910s, G. gwilith was “a breeze” (GL/45).
Reference ✧ Ety/WIL ✧ “air (as a region)”
|ᴹ√WIL||“fly, float in air”|
|ᴹ√WIL > gwilith||[wilitte] > [wilittʰe] > [wiliθθe] > [gwiliθθe] > [gwiliθθ] > [gwiliθ]||✧ Ety/WIL|