Definitions
1.nounThe shell of a clam.
2.nounA dredging bucket with hinges like the shell of a clam.
3.nounIn food service, the closing box (usually styrofoam but sometimes cardboard) given to consumers with take-out food.
4.nounAny object that has a hinge on one edge and two surfaces that close together.
5.nounAn amphitheater, especially an outdoor amphitheater; the semi-circular acoustic backdrop behind and above the performers.
6.adjectiveSimilar to the operation of a clam's shell, having a hinge with two sides closing together"It's a clamshell antenna."