A condition of tonic equality in which tension or osmotic pressure in two substances or solutions is the same. ... Origin: iso-+ G. Tonos, tension ... (05 Mar 2000) ... 
(i″so-to´ne-ә) a condition of equal tone, tension, or activity. equality of osmotic pressure between two elements of a solution or between two different solutions.
Type: Term Pronunciation: ī′sō-tō′nē-ă Definitions: 1. A condition of tonic equality in which tension or osmotic pressure in two substances or solutions is the same.
isotonia A condition of tonic equality in which tension or osmotic pressure in two substances or solutions is the same.