Leuk(o) is a prefix meaning which color?

• A. Black
• B. Red
• C. White
• D. Blue

Answer: (C)

Leuk(o)- denotes whiteness in medical terms, coming from the Greek leukos meaning white. This prefix is used in terms like leukocyte (white blood cell) and leukoderma (white skin patches), signaling the color white. It’s helpful to contrast it with prefixes for other colors—melano- or melan- for black, erythro- for red, and cyano- for blue—so you can see how each color is indicated. So the color represented by leuk(o) is white.