| lymantriid | (noun) dull-colored moth whose larvae have tufts of hair on the body and feed on the leaves of many deciduous trees | Synonyms: tussock moth |
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| lymph | (noun) a thin coagulable fluid (similar to plasma but) containing white blood cells (lymphocytes) and chyle; is conveyed to the blood stream by lymphatic vessels | - |
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| lymphadenitis | (noun) inflammation of lymph nodes | - |
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| lymphadenoma | (noun) an abnormally enlarged lymph node | - |
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| lymphadenopathy | (noun) chronic abnormal enlargement of the lymph nodes (usually associated with disease) | - |
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| lymphangiectasia | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasis |
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| lymphangiectasis | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasia |
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| lymphangiogram | (noun) an angiogram of the lymph nodes and lymph vessels made after the injection of a radiopaque substance | - |
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| lymphangiography | (noun) roentgenographic examination of lymph nodes and lymph vessels after injection of a radiopaque contrast medium; produces a lymphangiogram | Synonyms: lymphography |
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| lymphangioma | (noun) benign angioma consisting of a mass of lymphatic vessels | - |
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| lymphangitis | (noun) inflammation of a lymph vessel | - |
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| lymphedema | (noun) swelling (usually in the legs) caused by lymph accumulating in the tissues in the affected areas | - |
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| lymphoblast | (noun) an immature lymphocyte | - |
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| lymphocyte | (noun) an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection | Synonyms: lymph cell |
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| lymphocytopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphopenia |
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| lymphocytosis | (noun) an abnormal increase in the number of lymphocytes in the circulating blood | - |
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| lymphogranuloma | (noun) swelling of a lymph node | - |
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| lymphography | (noun) roentgenographic examination of lymph nodes and lymph vessels after injection of a radiopaque contrast medium; produces a lymphangiogram | Synonyms: lymphangiography |
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| lymphokine | (noun) a cytokine secreted by helper T cells in response to stimulation by antigens and that acts on other cells of the immune system (as by activating macrophages) | - |
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| lymphoma | (noun) a neoplasm of lymph tissue that is usually malignant; one of the four major types of cancer | - |
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| lymphopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphocytopenia |
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| lymphopoiesis | (noun) the formation of lymphocytes in the bone marrow and lymph nodes and thymus and spleen | - |
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| lymphuria | (noun) the presence of lymph in the urine | - |
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