Antiglobulin

Part of speech: noun

Definitions

1. A type of antibody that targets and binds to other antibodies attached to red blood cells, commonly used in medical tests to detect immune reactions
2. An immunoglobulin designed to identify and bind antibodies fixed on cell surfaces, often applied in diagnostic procedures evaluating blood compatibility
3. A specialized protein that attaches to immunoglobulins on cell membranes, facilitating detection of antibody presence in blood serology assays

Etymology: Antiglobulin is a compound built from two parts: "anti-", the Greek prefix meaning "against" or "opposed to", and "globulin", the name for a family of proteins found in blood plasma. Put together, the word names a substance that acts against globulins, and in practice that means an antibody directed at them. The prefix is the easy part to see; the second element carries the older history, since "globulin" was itself coined from the Latin "globulus", meaning "little sphere", a reference to the round shape of the particles early researchers observed. The term belongs to immunology, where it is used for the antibodies that react with the globulin proteins of another organism. Antiglobulin tests exploit this reaction. Because the antibody attaches to the globulins it is designed to detect, the reaction can reveal otherwise invisible antibodies or immune proteins bound to red blood cells.

Synonyms: antibody, immunoglobulin, antiserum, immunoglobulin antibody, immunoglobulin reagent