Tonus

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

Tonus is also a brand of fruit juice produced by the Lebedyansky division of PepsiCo in Russia