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Comprehensive
Dictionary Suite
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dingus (informal) an object whose name is forgotten or unknown; thingamajig.
doohickey (informal) a tool or gadget for which one does not know or remember the name; thingamajig.
gizmo (informal) something nameless or whose name is forgotten, esp. a mechanical gadget or part; thingamajig.
thingamabob (informal) something for which the precise name is unknown or has been forgotten; thingamajig.