spleen defined in 1951 yearspleen - spleen;
spleen - Mass of lymphoid tissue in mesentery of stomach or intestine of gnathostomes; but unlike lymph nodes is interposed in blood, not lymph, circulation. An important source of lymphocytes, and an important part of reticulo-endothelial system defending the bloodstream against invading organisms, and removing red blood cells at the end of their life. Acts also as a store of red blood cells; in emergency contraction of smooth muscle in spleen squeezes them into blood stream.
near spleen in Knolik
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