1. 小玩意儿；小装置
A gizmo is a device or small machine which performs a particular task, usually in a new and efficient way. People often use gizmo to refer to a device or machine when they do not know what it is really called.

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

Synonym: appliancecontraptioncontrivanceconveniencegadgetgismowidget

2. something unspecified whose name is either forgotten or not known

e.g. 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

Synonym: doodaddoohickeydoojiggergimmickgismogubbinsthingamabobthingumabobthingmabobthingamajigthingumajigthingmajigthingummywhatchamacallitwhatchamacallumwhatsiswidget