noun Electricity.
a device for measuring electromotive force or potential difference by comparison with a known voltage.

1880–85; potenti(al) + -o- + -meter

potentiometric [puh-ten-shee-uh-me-trik] , adjective
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World English Dictionary
potentiometer (pəˌtɛnʃɪˈɒmɪtə)
1.  an instrument for determining a potential difference or electromotive force by measuring the fraction of it that balances a standard electromotive force
2.  a device with three terminals, two of which are connected to a resistance wire and the third to a brush moving along the wire, so that a variable potential can be tapped off: used in electronic circuits, esp as a volume control

potentiometric (pəˌtɛnʃɪəˈmɛtrɪk)
chem (of a titration) having the end point determined by a change in potential of an electrode immersed in the solution

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American Heritage
Science Dictionary
potentiometer   (pə-těn'shē-ŏm'ĭ-tər)  Pronunciation Key 
  1. A mechanical variable resistor. See more at resistor.

  2. An instrument for measuring an unknown voltage by comparison with a known voltage, such as that of a generator.

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