| Noun | 1. |  stigma - the apical end of the style where deposited pollen enters the pistil reproductive structure - the parts of a plant involved in its reproduction style - (botany) the narrow elongated part of the pistil between the ovary and the stigma | 
| 2. | stigma - a symbol of disgrace or infamy; "And the Lord set a mark upon Cain"--Genesis demerit - a mark against a person for misconduct or failure; usually given in school or armed forces; "ten demerits and he loses his privileges" bend sinister, bar sinister - a mark of bastardy; lines from top right to bottom left cloven foot, cloven hoof - the mark of Satan symbol - an arbitrary sign (written or printed) that has acquired a conventional significance | |
| 3. | stigma - an external tracheal aperture in a terrestrial arthropod spiracle - a breathing orifice | |
| 4. | stigma - a skin lesion that is a diagnostic sign of some disease |