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histioblast his·ti·o·blast (hĭs’tē-ə-blāst’)
A tissue-forming cell. Also called histoblast.


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  • Histiocyte

    /ˈhɪstɪəˌsaɪt/ noun 1. (physiol) a macrophage that occurs in connective tissue histiocyte his·ti·o·cyte (hĭs’tē-ə-sīt’) n. A relatively inactive, immobile macrophage found in normal connective tissue. Also called fixed macrophage, histocyte. his’ti·o·cyt’ic (-sĭt’ĭk) adj.

  • Histiocytic medullary reticulosis

    histiocytic medullary reticulosis n. A rapidly fatal lymphoma, characterized by fever, jaundice, pancytopenia, and enlargement of the liver, spleen, and lymph nodes. The affected organs show focal necrosis and hemorrhage, with proliferation of histiocytes and with phagocytosis of the red blood cells.

  • Histiocytoma

    histiocytoma his·ti·o·cy·to·ma (hĭs’tē-ō-sī-tō’mə) n. pl. his·ti·o·cy·to·mas or his·ti·o·cy·to·ma·ta (-mə-tə) A tumor composed of histiocytes.

  • Histiocytosis x

    histiocytosis X n. Any of a group of disorders of unknown cause characterized by histiocytic proliferation, including Hand-Schüller-Christian disease.

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