stigma in WordNet English dictionary

1. a symbol of disgrace or infamy
   "And the Lord set a mark upon Cain"--Genesis
   mark  stigma  brand  stain 
   
2. a skin lesion that is a diagnostic sign of some disease
   stigma 
   
3. an external tracheal aperture in a terrestrial arthropod
   stigma 
   
4. the apical end of the style where deposited pollen enters the pistil
   stigma