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rheostat noun [C]. âº a âdevice used to âcontrol and âchange the âflow of âelectric âcurrent through a âmachine such as an âelectric âlight. (Definition of rheostat from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press).
Homeostasis. The mechanisms involved in the maintenance of a stable, internal environment. The body's ability to physiologically regulate its inner environment to ensure its stability in response to fluctuations in the outside environment.