Designating a part of a machine from which items are taken off. Also: designating a device or component designed to remove something.

(of a tool, device, etc.) operating by means of a compressed or stretched spring acting on one or more components.

Of a bridge, spring, or other mechanical part or structure: that can be drawn or moved back or in; that retracts. Also: relating to or involving such…

having the qualities or characteristics of a gadget; fitted with a gadget or gadgets; given to acquiring or using gadgets.