clamshell

Short definition from Wiktionary

Noun

1. 1
   The shell of a clam.
2. 2
   Any object that, in (literal or figurative) resemblance to the shell of a clam, has a hinge on one edge and two surfaces that close together.
3. 3
   Any object that, in (literal or figurative) resemblance to the shell of a clam, has a hinge on one edge and two surfaces that close together: A dredging bucket with hinges like the shell of a clam.
4. 4
   Any object that, in (literal or figurative) resemblance to the shell of a clam, has a hinge on one edge and two surfaces that close together: In food service, the closing box (usually styrofoam but sometimes cardboard) given to consumers with takeout food.
5. 5
   Any object that, in (literal or figurative) resemblance to the shell of a clam, has a hinge on one edge and two surfaces that close together: mouth
6. 6
   Any object with some other resemblance to either one or both halves of the shell of a clam.
7. 7
   Any object with some other resemblance to either one or both halves of the shell of a clam: An amphitheater, especially an outdoor amphitheater; the semi-circular acoustic backdrop behind and above the performers.

Verb

1. 1
   To deform a die in a shape resembling the shell of a clam, as a result of uneven extrusion pressure.
2. 2
   To dig out by means of a clamshell (dredging bucket).
3. 3
   To compress or flatten underwater debris so as to avoid blocking a channel.
4. 4
   To open or close by means of a hinge, similar to the way a clamshell opens and closes.