Tonus

Tonus is the Latin equivalent of the English word tone, and may 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