Dean Vaughn Medical Terminology Practice Test

Dys- signals a problem: something is bad, difficult, painful, or abnormal. That makes it the best choice for this question, because in medical terms it flags dysfunction or a abnormal condition rather than indicating movement (which would come from a motion-related root), skin, or a general into/not meaning. Examples help solidify the idea: dysuria means painful or difficult urination; dysplasia means abnormal development; dysfunction means impaired function. So the prefix dys- consistently points to a negative or problematic state, which is why “bad” is the correct meaning.