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gismo

noun

1.

something unspecified whose name is either forgotten or not known

dojigger doodad doohickey gimmick gizmo gubbins thingamabob thingamajig thingmabob thingmajig thingumabob thingumajig thingummy whatchamacallit whatchamacallum whatsis widget

2.

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

appliance contraption contrivance convenience gadget gizmo widget