weir

English Thesaurus

1. a low dam built across a stream to raise its level or divert its flow (noun.artifact)

hypernym	:	dam, dike, dyke,
definition	:	a barrier constructed to contain the flow of water or to keep out the sea (noun.artifact)

2. a fence or wattle built across a stream to catch or retain fish (noun.artifact)

hypernym	:	fence, fencing,
definition	:	a barrier that serves to enclose an area (noun.artifact)