1. Any of various small marine clams of the genus Donax having variously colored, often striped or banded wedge-shaped shells, and found especially on sandy beaches along the Atlantic coast of the United States.
2. A soft porous limestone, composed essentially of fragments of shells and coral, used as a building material.
[Spanish, cockle, probably diminutive of concha, shell, from Latin, mussel; see CONCH.]
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