potentiometernoun [ C ]
/pə.ten.ʃiˈɒm.ɪ.tər//pə.ten.ʃiˈɑː.mə.t̬ɚ/specializedan instrument for measuring electromotive force (= a difference in electric potential)
a resistor (= part of an electrical circuit that produces a resistance to the flow of current) that has three terminals (= points of connection)