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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).
A homeostatic mechanism is the property of a system, either open or closed, that regulates its internal environment and tends to maintain a stable, constant condition. For exa â¦ mple: the hypothalamus (which is a homeostatic mechanism) senses when your body's temperature is too high or too low.