gizmo in WordNet English dictionary

1. a device or control that is very useful for a particular job
   appliance  contraption  contrivance  convenience  gadget  gizmo  gismo  widget 
   
2. something unspecified whose name is either forgotten or not known
   "she eased the ball-shaped doodad back into its socket"; "there may be some great new gizmo around the corner that you will want to use"
   doodad  doohickey  doojigger  gimmick  gizmo  gismo  gubbins  thingamabob  thingumabob  thingmabob  thingamajig  thingumajig  thingmajig  thingummy  whatchamacallit  whatchamacallum  whatsis  widget 
   

gizmo in English Wiktionary