• A mechanical device or part whose name is forgotten or unknown; a gadget.
  • A nonsensical placeholder name for something that one does not know the proper term for; <xref>gadget</xref>; <xref>whatchamacallit</xref>; <xref>thingamajig</xref>.
  • something unspecified whose name is either forgotten or not known
  • a device or control that is very useful for a particular job
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