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Tonus is the Latin equivalent of the English word tone. It is especially used to refer to:
- Muscle tone, the continuous and passive partial contraction of the muscles
- Arterial tone, the continuous and passive partial contraction of the arterioles
- Tonicity, the ability of a solution to cause water movement
- The Pythagorean interval of 9/8
- A brand of fruit juice produced by the Lebedyansky division of PepsiCo in Russia
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