Which term means pertaining to against urination?

• A. Antidiuretic
• B. Angioma
• C. Antibiotic
• D. Antipyretic

Answer: (A)

The main idea here is how medical terms use prefixes to change meaning. The prefix anti- means against, and diuretic relates to urine production. Put together, anti + diuretic describes something that opposes urine formation or urination. That’s why antidiuretic is the term that means pertaining to against urination. For example, antidiuretic hormone (vasopressin) reduces urine output, which is exactly the opposite of diuretics that promote urine production. The other terms point to different concepts—angioma is a blood vessel tumor, antibiotic targets bacteria, and antipyretic reduces fever.