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1.
1)The tip of the female part of the flower, which receives the male pollen grains.

2)A negative stereotype about a group of people.

3)A mark of disgrace or shame.
e.g for 1 is hard to define by a normal person unless he/she happens to be a doctor or a surgeon.

e.g for 2& 3: John has stigma about black people,
Peter felt stigma about his apperance.
by Jay Sharma April 21, 2008