What is the meaning of the prefix "Eu-"?

The prefix "Eu-" originates from Greek, where it denotes something positive or favorable. In medical terminology, it is often used to convey a sense of "good," "normal," or "well." For instance, the term "euthanasia" refers to the act of bringing about a gentle and painless death, showcasing a merciful disposition. Additionally, "eupnea" describes normal or good breathing. This prefix is integral in conveying the nuances of health and well-being in medical contexts, making it a foundational component of various medical terms.