Potentiometer
WordNet
noun
(1) A resistor with three terminals, the third being an adjustable center terminal; used to adjust voltages in radios and TV sets
(2) A measuring instrument for measuring direct current electromotive forces
WiktionaryText
Noun
- a user-adjustable variable resistor that functions as a voltage divider.
- an instrument that measures a voltage by opposing it with a precise fraction of a known voltage, and without drawing current from the unknown source.