A barrier built out into the sea or a river to prevent erosion or to direct water currents; also spelled 'groin.'
From Middle English and Old French 'groigne,' possibly from Latin 'grunum' or related to 'groin.' The structure juts out like a groin might from a body.
Groynes are civil engineering genius—they're built perpendicular to coastlines to trap sand and prevent beaches from washing away, and they create those cool tide pools where kids find starfish.
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