What does histiocyte mean?
A histiocyte is a specialized macrophage found within tissues rather than circulating freely in the blood. Its principal function is phagocytosis: the cell surrounds and digests microorganisms, foreign particles, dead cells, and cellular debris. Histiocytes occur throughout the body and are especially prominent in organs such as the lymph nodes, spleen, liver, lungs, and connective tissue. Their appearance and behavior can vary with the tissue in which they live and with the conditions to which they are responding. The term is mainly used in clinical and scientific contexts, including pathology, immunology, and histology. It is also useful in discussing the accumulation of these cells within a lesion, a process sometimes described as histiocytic infiltration. In ordinary medical discussion, macrophage is generally the more accessible term, whereas histiocyte gives more precise attention to the cell's tissue-based role.
nounA macrophage, or specialized immune cell, that resides in tissues and engulfs foreign particles, microorganisms, and cellular debris. Histiocytes are especially abundant in the lymph nodes, spleen, liver, lungs, and connective tissues.
- A macrophage or similar phagocytic immune cell found in tissues.
"The biopsy revealed histiocytes containing the characteristic intracellular organisms."
"Specialized histiocytes in the liver remove old red blood cells from the bloodstream."
"Researchers used a stain to identify macrophages that had developed into foamy histiocytes."
The plural is formed by adding -s and is used routinely in medical and scientific prose.
"Large numbers of histiocytes accumulated around the site of the injury."
Histiocytes are the cleanup crew of the immune system, patrolling tissues and swallowing pathogens, debris, and other unwelcome material.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does histiocyte come from?
Histiocyte was formed in the 19th century from Greek histion, meaning tissue, and kytos, meaning cell, with the connecting element -o-. The formation follows the established Greek compound pattern used in scientific terminology for cells associated with a particular tissue or substance. Its close semantic relative is macrophage, from Greek makrophagos, meaning large-eating cell, although histiocyte is more specifically associated with macrophages in tissues.
Related word forms
How histiocyte is actually used
This is a specialist term used chiefly in medicine, histology, and pathology. In general medical usage, macrophage is more familiar, while histiocyte is particularly useful when discussing a macrophage identified by its tissue location or morphology.
Easily confused with histiocyte
A histiocyte is a tissue macrophage that engulfs particles, whereas a lymphocyte is primarily an immune cell involved in antibody-mediated or cell-mediated immunity.