spleen
n//spliːn//mjälte
(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.
(archaic, except in the set phrase "to vent one's spleen") A bad mood; spitefulness. Compare gall.
(obsolete, rare) A sudden motion or action; a fit; a freak; a whim.
(obsolete) Melancholy; hypochondriacal affections.
A fit of immoderate laughter or merriment.