weir

Noun
  1. A low dam built across a stream to raise its level or divert its flow (synset 104578852)
    is a type of: dam, dike, dyke - a barrier constructed to contain the flow of water or to keep out the sea
  2. A fence or wattle built across a stream to catch or retain fish (synset 104578972)
    is a type of: fence, fencing - a barrier that serves to enclose an area

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