noun
a state of normal tension in the muscles, especially the muscles of the limbs, maintained by central nervous system control and in the absence of voluntary effort
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The physical therapist assessed the patient's muscle tonus to determine any abnormalities.
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I've been working out regularly to improve my tonus.
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I can feel my tonus getting better since I started going to the gym.
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The tonus of the team was high as they prepared for the championship game.