An Ilkorin adjective meaning “pebbly” used for the river name Brithon (Ety/BIRÍT). It seems to be a combination of brith “broken stones, gravel” and an adjective suffix -on.
Doriathrin
brith
noun. broken stones, gravel
brithombar
place name. *Brithon-home
brithon
adjective. pebbly
brithon
place name. Pebbly
A word for “broken stones, gravel” developed from the primitive form ᴹ✶b’rittē or ✱✶birittē (Ety/BIRÍT), because in Ilkorin unstressed initial syllables reduced to favored clusters.