(obsolete) A thing whose name cannot be remembered; thingamajig, doohickey. / Any device or machine, especially one whose name cannot be recalled. Often either clever or complicated.

plural of gadget

someone interested in, or owning a lot of, gadgets

plural of gadgeteer

(uncountable) machines, technology / (countable, usually in the plural) A gadget.

(transport, derogatory, slang) A public transportation scheme based on modern technology which seems to be infeasible or unnecessary.

plural of gadgetry

Devoid of gadgets.

plural of gadgetbahn

(informal) Characterised by gadgets; hi-tech in a gimmicky way.