A type of sluice gate or tidal barrier, especially one used in coastal areas to control the flow of water.
From French aboideau, possibly derived from Acadian French or Mi'kmaq influences. A maritime term specific to certain coastal regions, particularly Atlantic Canada.
Aboideaus are brilliant low-tech engineering in Atlantic Canada—farmers built them to let tidewater flow through during high tide, then close the gate to trap fresh water for irrigation, turning salty tidal flats into productive farmland!
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