Proto-IE: *bhrozdh-
Meaning: sharp edge, top
Celtic: *brozdo-s > MIr brot `Stachel', Ir brod `id.'; Cymr brathu `stechen, beissen'; brath `Stich, Biss', OCorn bros `Stachel', Corn brath-cy `Kettenhund', OBret brothrac gl. `agipam i. e. acupicam', Bret broud `Stachel'
Russ. meaning: острый край/конец
References: WP II 132 f