Also found in: Thesaurus, Encyclopedia, Wikipedia.
A long, relatively narrow island running parallel to the mainland, built up by the action of waves and currents and serving to protect the coast from erosion by surf and tidal surges.
a broad, sandy island that runs parallel to the mainland and protects it from hurricanes, tidal waves, etc.
A long, narrow sand island that is parallel to the mainland and serves to protect the coast from erosion.
A long, low, narrow, sandy island separated from the mainland by a lagoon.