名詞 weir:

1. a low dam built across a stream to raise its level or divert its flow
2. a fence or wattle built across a stream to catch or retain fish

weir

n.（名詞）
A fence or wattle placed in a stream to catch or retain fish.
魚梁：在河流中用來捕獲或攔截魚的柵欄或枝條籬
A dam placed across a river or canal to raise or divert the water, as for a millrace, or to regulate or measure the flow.
堰，攔河壩，擋流壩：橫截河流或運河以提高水位或使河水轉向的壩， 如用于推動水車，調節(jié)或測量水流

來源：
Middle English were
中古英語 were
from Old English wer * see wer- 4
源自 古英語 wer *參見 wer- 4