Definition of rheostat
: a resistor for regulating a current by means of variable resistances
rheostaticplay \ˌrē-ə-ˈsta-tik\ adjective
Recent Examples of rheostat from the Web
A rheostat allows the throttle to be fine-tuned to sustain walking speeds.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rheostat'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of rheostat
Seen and Heard
What made you want to look up rheostat? Please tell us where you read or heard it (including the quote, if possible).