What is the meaning of Spleen?

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.

A bad mood; spitefulness. Commpare gall.

A sudden motion or action; a fit; a freak; a whim.

Melancholy; hypochondriacal affections.

A fit of immoderate laughter or merriment.

To dislike.

To annoy or irritate.

To complain; to rail; to vent one's spleen.

To remove the spleen, or, by extension, to gore.

To excise or remove.

bad mood, melancholy

Alternative spelling of splin

spleen (melancholy)

spleen (melancholy, ennui)

Source: wiktionary.org