What does the word spleen mean?

Usage examples for spleen

  1. Waal, seem' haow 'twas, I tried tew please him, late as it was; but ef there was ennything I did spleen ag'inst it was farmin', 'specially arfter the smart times I'd ben hevin', up Oldtaown way. – Kitty's Class Day And Other Stories by Louisa M. Alcott
  2. Where he comes shaking by me: good my Lord, Forget your spleen to me, I never wrong'd you, But would have peace with every man. – The Maids Tragedy by Francis Beaumont and John Fletcher
  3. In this fit of the spleen he went to the theatre: there were eleven people in the boxes. – The Young Duke by Benjamin Disraeli