Iso-osmotic refers to a solution that has the same osmotic pressure as another solution. Some synonyms for the word iso-osmotic include isosmotic, equiosmotic, and isotonic. These words all describe a solution that has the same concentration of solutes as another solution. Another similar term is isosmolal, which refers to a solution that has the same number of particles per kilogram as another solution. These terms are important in biology, chemistry, and medicine as they help to describe and compare solutions in various contexts, such as in the human body or in laboratory experiments.