a mechanical contrivance or device; any ingenious article.

1850–55; origin uncertain; compare French gâchette the catch of a lock, sear of a gunlock

gadgety [gaj-i-tee] , adjective

contraption; whatsis, doohickey, thingamajig. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gadget (ˈɡædʒɪt)
1.  a small mechanical device or appliance
2.  any object that is interesting for its ingenuity or novelty rather than for its practical use
[C19: perhaps from French gâchette lock catch, trigger, diminutive of gâche staple]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1886, gadjet (but said to date back to 1850s), sailors' slang word for any small mechanical thing or part of a ship for which they lacked, or forgot, a name; perhaps from Fr. gâchette "catchpiece of a mechanism," dim. of gâche "staple of a lock."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was the ideal dance for the transistorized age, converting the body itself into a novelty device-a nifty gadget.
Anyone who is trying to authenticate your research will now have to buy some
One of its first projects is to design a laser-based gadget that can diagnose
  the condition of crops.
But conductive materials aren't enough to make an electronic gadget work.
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