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1. The shell of a clam.
2. 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.


1. (Mechanical Engineering) chiefly US a dredging bucket that is hinged like the shell of a clam
2. (Aeronautics) aeronautics
a. an aircraft cockpit canopy hinged at the front and rear
b. the hinged door of a cargo aircraft
c. another name for eyelid2
3. any of a variety of objects hinged like the shell of a clam, such as a container for takeaway food, a portable computer, etc



1. the shell of a clam.
a. Also called clam′shell buck`et. a dredging bucket opening at the bottom, consisting of two similar pieces hinged together at the top.
b. a machine equipped with such a bucket.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.clamshell - the shell of a clamclamshell - the shell of a clam      
shell - the hard largely calcareous covering of a mollusc or a brachiopod
2.clamshell - a dredging bucket with hinges like the shell of a clam
dredging bucket - a bucket for lifting material from a channel or riverbed
References in periodicals archive ?
Contract notice: 1 load-bearing chassis, 32 t gvw, 44 t of ptra equipped with 1 ampliroll lifting arm, 1 crane with grab bucket and 1 towing hook, and 1 box trailer
The crane's grab bucket suddenly closed, crushing his neck while he was in the hold of the ship attaching bags of cobblestones to hooks which had been welded to the inside of the grab.
Tenders are invited for provide new four-rope dual scoop 23 cy clamshell grab bucket with a maximum density of 75 lbs per cubic foot, engineered using the latest finite element analysis to reduce weight, increase payload while maintaining structural integrity.
Mr Jones died when the crane's grab bucket suddenly closed, decapitating him, as he was unloading cobbles from a Polish ship.