phagocyte : Idioms & Phrases
fixed phagocyte
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noun a phagocyte that does not circulate in the blood but is fixed in the liver or spleen or bone marrow etc.
WordNet
free phagocyte
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noun a phagocyte that circulates in the blood
WordNet
mononuclear phagocyte system
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noun a widely distributed system of free and fixed macrophages derived from bone marrow
MPS; system of macrophages.