spleen

  1. Noun.  (anatomy, immunology) In vertebrates, including humans, a ductless vascular gland, located in the left upper abdomen near the stomach, which destroys old red blood cells, removes debris from the bloodstream, acts as a reservoir of blood, and produces lymphocytes.
  2. Noun.  (archaic, except in the set phrase ''"to vent one's spleen"'') A bad mood; spitefulness.

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This entry was last updated on RefTopia from its source on 3/20/2012.