1. (

• 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. (

• appliance ,
• contraption ,
• contrivance ,
• convenience ,
• gadget ,
• gizmo ,
• gismo ,
• widget

) a device or control that is very useful for a particular job ;