An arm (of the sea); a branch or ‘fork’ (of a stream). Obsolete.
As part of a river or river-system. In U.S., Canada, Australia, New Zealand, etc.: A branch of a main river, a tributary river; a rivulet, brook…
A forking, bifurcation, or division into branches; the point at which anything forks. Hence, each of the… The point at which a river divides into…
transferred. Each of two branches of a stream.