☆ a dredging bucket, hinged like the shell of a clam
adjective
designating or of a manufactured product designed to open and close by a hinge along one edge
See clamshell in American Heritage Dictionary 4
(klămˈshĕlˌ)
noun
The shell of a clam.
Any of various devices that consist of two parts attached by a hinge and that open and close like a clamshell, especially a digging or dredging machine with a bucket that has hinged jaws or a handheld electronic device.