Which prefix means "good" or "well"?

The prefix "Eu-" means "good" or "well." This is derived from Greek, where "eu" is used to suggest something positive or beneficial. For example, in medical terminology, "euthanasia" refers to a "good death," highlighting a positive connotation in its use. This prefix is commonly found in various terms across different disciplines, indicating health, wellness, or favorable conditions.

The other prefixes provided do not convey the same meaning. "Dys-" indicates something abnormal, difficult, or impaired, often used in terms like "dysfunction." "Homo-" relates to similarity or sameness, as seen in words like "homogeneous." "Pseudo-" means false or deceptive, as used in terms like "pseudoscience." Each of these prefixes carries its own distinct implications, which differ significantly from the positive connotation of "Eu-."