Definitions from Wiktionary (gadget)

▸ noun:  (obsolete) A thing whose name cannot be remembered; thingamajig, doohickey.
▸ noun:  Any device or machine, especially one whose name cannot be recalled, often either clever or complicated.
▸ noun:  (informal) Any consumer electronics product.
▸ noun:  (computing) A sequence of machine code instructions crafted as part of an exploit that attempts to divert execution to a memory location chosen by the attacker.
▸ noun:  (computer science) A technique for converting a part of one problem to an equivalent part of another problem, used in constructing reductions.
▸ noun:  (glassblowing) A spring clip attached to the end of a punty in order to grasp the foot of a glass without leaving a bullion while finishing the bowl.

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