Don't sweat this long word! It describes what happens when there's not enough water in your body. Be sure to drink a lot of water to stay happily hydrated.
Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
Images provided by iStock, Getty Images, Corbis, Veer, Science Photo Library, Science Source Images, Shutterstock, and Clipart.com