Which term means blue skin?

• A. Cyanosis
• B. Cranium
• C. Cribriform
• D. Cyanoderma

Answer: (D)

The main idea is understanding how medical word parts build color and body-part terms. cyan- means blue, and -derma means skin, so cyanoderma literally translates to blue skin. That direct breakdown makes it the best fit for describing blue skin itself. In contrast, cyanosis uses the same blue-root but with -osis, indicating a condition or process—bluish discoloration from factors like low oxygen—not a term that names the skin itself. The other roots point to the skull (cranium) or a sieve-like structure (cribriform), which have nothing to do with color or skin. So cyanoderma is the term that directly means blue skin.