n. An electrical resistor, with two terminals, whose resistance is continuously variable by moving a knob or slider.
the GNU version of the Collaborative International Dictionary of English
n. A contrivance for adjusting or regulating the strength of electrical currents, operating usually by the intercalation of resistance which can be varied at will.
The Century Dictionary and Cyclopedia
n. In electromagnetism, an instrument for regulating lating or adjusting a circuit so that any required degree of resistance may be maintained; a resistance-coil. See resistance, 3.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. resistor for regulating current
Word Usage
"Fan switching is relatively easy however RPM control is not, for this you needed called a rheostat baybus."