A word for “mast” developed from the primitive form ᴹ✶b’rethā or *✶berethā (Ety/BERÉTH), because in Ilkorin unstressed initial syllables reduced to favored clusters. The primitive word originally was originally associated with beech trees, and the Ilkorin meaning was likely due to the use of these trees for masts in ship-building practices of Beleriand. The normal Ilkorin word for “beech” is galbreth or neldor.
brethnoun. (beech) mast, beech-mast