1. the state or quality of having equal osmotic pressure, especially between two solutions separated by a membrane
Usage: medical; scientific
2. the property of having equal tension or tone, especially in muscles
Usage: medical; physiology

Examples

• The isotonicity of the saline solution made it safe for intravenous use.
• Doctors check for isotonicity when preparing IV fluids for patients.
• The cell membrane maintained isotonicity with the surrounding fluid.
• Isotonicity prevents cells from swelling or shrinking in solution.
• Physical therapists work to restore isotonicity between opposing muscle groups.
• The sports drink was formulated to maintain isotonicity with body fluids.