Definition of Gizmo: noun /ˈgizmō/ gizmos, plural: A gadget. A gadget is a small technological object (such as a device or an appliance) that has a particular function, but is often thought of as a novelty. Gadgets are invariably considered to be more unusually or cleverly designed than normal technological objects at the time of their invention. Gadgets are sometimes also referred to as gizmos.

From Wikipedia, the free encyclopedia