stigma

(noun) the apical end of the style where deposited pollen enters the pistil.

(noun) a symbol of disgrace or infamy. Synonyms: mark, brand, stain. Example: "And the lord set a mark upon cain"--genesis."

(noun) an external tracheal aperture in a terrestrial arthropod.

(noun) a skin lesion that is a diagnostic sign of some disease.