Gadget

A gadget is a small tool such as a machine that has a particular function, but is often thought of as a novelty. Gadgets are sometimes referred to as gizmos. ==History== The origins of the word `gadget` trace back to the 19th century. According to the [Oxford English Dictionary], there is anecdotal (not necessarily true) evidence for the use of .....
Found on http://en.wikipedia.org/wiki/Gadget

Gadget

[computer science] In computational complexity theory, a gadget is a subset of a problem instance that simulates the behavior of one of the fundamental units of a different computational problem. Gadgets are typically used to construct reductions from one computational problem to another, as part of proofs of NP-completeness or other types ...
Found on http://en.wikipedia.org/wiki/Gadget_(computer_science)

Gadget

Fire control radar / Emitter of radar equipment.
Found on http://www.f-16.net/glossary-G.html

Gadget

Spring-clip device used (from c 1860) for holding the foot of a drinking-glass while it was finished, so obviating the pontil mark
Found on http://www.great-glass.co.uk/glass%20notes/glossa-e.htm
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