Ceruloplasmin

Part of speech: noun

Definitions

1. A serum protein that binds copper and is involved in the transport of this metal while also playing a critical role in iron metabolism and homeostasis within the bloodstream
2. This protein functions primarily in copper transport in blood plasma and assists in regulating iron levels and oxidative reactions related to iron metabolism
3. A blood plasma protein that carries copper and is essential for iron regulation and metabolic processes involving iron and oxidative stress

Etymology: Ceruloplasmin is a scientific coinage, built from two parts that have nothing to do with each other in ordinary speech. The first, "cerulo," comes from Latin "caeruleus," meaning blue, the same root that gives English "cerulean." The second, "plasmin," is a name formed on the pattern of "plasma," the fluid portion of blood. Put together, the name describes a blood protein that is blue in colour and carries copper, a combination that reflects the protein's most striking physical trait. The blue colour comes from the copper atoms the protein binds, which give it a distinctive tint in solution. Because the name was assembled from classical roots, it belongs to modern biochemistry rather than to ancient Latin usage, even though its first part reaches back to a Roman word for the colour of the sky.