spleen

n. organ which is located near the stomach and which filters and stores blood and produces white blood cells and destroys old red blood cells; bad temper, peevishness, spite; melancholy (Archaic)

The spleen is an organ located in the abdomen of the human body, where it functions in the destruction of old red blood cells and holding a small reservoir of blood. It is regarded as one of the centers of activity of the reticuloendothelial system (part of the immune system). Until recently, the purpose of the spleen was not known. It is increasingly recognized that its absence leads to a predisposition to certain infections.
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Spleen a large, glandlike organ situated in the upper left part of the abdominal cavity, lateral to the cardiac end of the stomach. [more]Spleen - Community and Resources

Noun
1. a large dark-red oval organ on the left side of the body between the stomach and the diaphragm; produces cells involved in immune responses
(synonym) lien
(hypernym) lymphatic tissue, lymphoid tissue
(part-holonym) lymphatic system, systema lymphaticum
(part-meronym) lienal artery, splenic artery, arteria lienalis
2. a feeling of resentful anger
(synonym) irascibility, short temper, quick temper
(hypernym) bad temper, ill temper

n. eccentricity, oddity, strangeness, strange behavior, irregular way of acting, weird behavior