n. The shell of a clam.n. A dredging bucket with hinges like the shell of a clam.n. In foodservice, the white, usually styrofoam box given to consumers with take-out food.n. An object which has a hinge on one edge and two surfaces that close togethern. An amphitheater, especially an outdoor amphitheater; the semi-circular acoustic backdrop behind and above the performers.adj. similar to the operation of a clam's shell, having a hinge with two sides closing together