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. (noun)
A bad mood; spitefulness. (noun)
To dislike. (verb)
Examples of word spleen
After we had fed, we drew ourselves back to our boats upon the river, and there came to us all the lords of the country, with all such kind of victual as the place yielded, and with their delicate wine of pinas, and with abundance of hens and other provisions, and of those stones which we call spleen-stones.
When the spleen is large, your physician may prescribe a spleen guard to be worn during gym or during certain activities to protect the spleen from injury.
You know it's a good post when a humming birds spleen is used as a frame of reference though I do believe the aforementioned bases/rings are way heavier than a gnats ass!
The full review is only available online to subscribers, but you can get a sense of his level of spleen from the opening paragraphs.
The liver is long and simple; the spleen is short and round: as is the case in both respects with the saurians.