1. (noun) doodad, doohickey, doojigger, gimmick, gizmo, gismo, gubbins, thingamabob, thingumabob, thingmabob, thingamajig, thingumajig, thingmajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget
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"
2. (noun) appliance, contraption, contrivance, convenience, gadget, gizmo, gismo, widget
a device or control that is very useful for a particular job
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Definitions of gizmo 
