ᴹ√BERETH root. “beech”
A root in The Etymologies of the 1930s serving principally as the basis for N. brethil “beech” (Ety/BERÉTH). In the notes from the late 1950s or early 1960s Tolkien instead connected brethil to the root √BARATH and S. bereth “queen”, where it had the true meaning of “princess” (PE17/23). But that could be a later association rather that a genuine etymology, and doesn’t necessarily invalidate ᴹ√BERETH (especially given the other phonological issues with S. bereth < √BARATH).
References ✧ Ety/BERÉTH, GALAD, NEL, PHER; EtyAC/BERÉTH