Leuko- is a prefix that means which color?

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

Answer: (A)

Leuko- comes from Greek leukos, meaning white. In medical terms it signals whiteness, as in leukocytes (white blood cells) or leukoderma (white patches of skin). So the color indicated by leuko- is white. For contrast, other color prefixes exist—erythro- for red, melano- for black, xantho- for yellow—but they’re not the ones here.