/ Dictionary / Index R rheostat: Meaning and Definition of Find definitions for: rhe•o•stat Pronunciation: (rē'u-stat"), [key] — n. Elect. an adjustable resistor so constructed that its resistance may be changed without opening the circuit in which it is connected, thereby controlling the current in the circuit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rheostat (Thesaurus) rheoreceptor rheotaxis Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language