Definition of spleen
1
: a highly vascular ductless organ that is located in the left abdominal region near the stomach or intestine of most vertebrates and is concerned with final destruction of red blood cells, filtration and storage of blood, and production of lymphocytes
2
obsolete
: the seat of emotions or passions
4
: feelings of anger or ill will often suppressed
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Merriam-Webster unabridged
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Time Traveler for spleen
The first known use of spleen was in the 14th century
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