Definitions
1.nounIn 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(except in the set phrase "to vent one's spleen") A bad mood; spitefulness.
3.nounA sudden motion or action; a fit; a freak; a whim.
4.nounMelancholy; hypochondriacal affections.
5.nounA fit of immoderate laughter or merriment.
6.verbTo dislike.