An adjective for “green” derived from the root ᴹ√GWEN (Ety/GWEN). Its Quenya cognate ᴹQ. wenya suggests its primitive form was ✱✶gwenyā [gwenjā]. If so, it is an example of how, after [[ilk|final [a] was lost]], the [[ilk|final [j] became [i]]] and then became [e], as suggested by Helge Fauskanger (AL-Ilkorin/gwene).
Doriathrin
legol
adjective. nimble, active, running free
legolin
place name. Legolin
gwene
adjective. green
An Ilkorin adjective meaning “nimble, active, running free” developed from the root ᴹ√LEK, an element in the river name Legolin (Ety/LEK). It probably developed from a primitive form ✱✶leklā: after the [[ilk|primitive final [a] was lost]], the resulting [[ilk|final [l] became syllabic and developed into [-ol]]], as suggested by Helge Fauskanger (AL-Ilkorin/legol).
Conceptual Development: Tolkien did not revise the river name Legolin after abandoning the Ilkorin language, so it is possible he reconceived this word as Sindarin. Its phonetic development from ✱✶leklā would have produced the same result in Noldorin/Sindarin.