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potentiometer (n.)

"instrument for measuring the difference of electrical potential between two points," 1868, a hybrid formed from combining form of Latin potentia "power" (see potential) + Greek-derived -meter. Related: Potentiometric.

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Definitions of potentiometer from WordNet

potentiometer (n.)
a measuring instrument for measuring direct current electromotive forces;
potentiometer (n.)
a resistor with three terminals, the third being an adjustable center terminal; used to adjust voltages in radios and TV sets;
Synonyms: pot
From wordnet.princeton.edu