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Definition of Black plague
1. Noun. The epidemic form of bubonic plague experienced during the Middle Ages when it killed nearly half the people of western Europe.
Medical Definition of Black plague
1. In 14th-century Europe, the victims of the black plague had bleeding below the skin (subcutaneous haemorrhage) which made darkened ( blackened ) their bodies. Black plague can lead to black death characterised by gangrene of the fingers, toes, and nose. Black plague is caused by a bacterium (Yersinia pestis) which is transmitted to humans from infected rats by the oriental rat flea. (12 Dec 1998)