Definition of weir noun from the Oxford Advanced Learner's Dictionary



BrE BrE//wɪə(r)//
; NAmE NAmE//wɪr//
Rivers and lakes
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a low wall or barrier built across a river in order to control the flow of water or change its direction Flood water was pouring over the weir in a thundering torrent. See related entries: Rivers and lakes Word OriginOld English wer, from werian ‘dam up’.
See the Oxford Advanced American Dictionary entry: weir