How to say "weir" in Japanese

• 堤防ていぼうJLPT N1approx.Common
  nounIts core senses are embankment, levee and bank: a bank raised along a river against flooding. 'Weir' is only a secondary gloss, so for a barrier across a stream prefer 堰.
  子供こどもたちは堤防ていぼうをすべりおりた。↗

  The children slid down the bank.
• 堰せきCommon
  nounThis is the word for a weir in the usual sense: a barrier built across a river to raise the water level or regulate its flow. Its glosses also cover dam, barrier and sluice.

For 'weir' as a barrier built across a river to control water level or flow, use 堰; 堤防 is primarily an embankment or levee raised along a bank against flooding, with 'weir' only a secondary gloss.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 堤防ていぼうbank
• 堰せきdam
• しがらみweir
• 頭首工とうしゅこうweir (usu. for irrigation)
• 堰堤えんていdam
• 梁やな(fish) weir