Leuko

Part of speech: noun, prefix

Definitions

1. A prefix referring to the color white, often used in medical terminology to denote conditions related to white blood cells or pigmentation
2. A term used in various scientific contexts, particularly in biology, to describe substances or cells that appear white or are associated with whiteness
3. Indicative of white or light-colored elements in health terminology, frequently relating to the blood or skin conditions associated with a lack of pigmentation

Etymology: The prefix "leuko-" carries a Greek word for brightness rather than anything specifically medical. In ancient Greek, "leukós" meant "white," and it was used of things as varied as bright light, snow, chalk and milk. English took the root in the form "leuco-" and "leuko-" (the two spellings are alternatives), and it became a standard building block for scientific and medical terms, where it signals something pale, colourless or white. The prefix is most familiar in "leukocyte," the term for a white blood cell, where "leuko-" joins the Greek "kytos," meaning "hollow vessel" or "cell." Its uses are not limited to blood, though. The same element appears in "leukoderma," a loss of skin pigment, and in "leukoplakia," a whitish patch on mucous membranes. Words like these were coined in modern scientific English from classical Greek roots, so the ancient Greeks themselves would not have recognised them as medical terms.

Synonyms: white, leucocyte (related), leukocyte, white blood cell