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Definition of smallpox : A contagious, constitutional, febrile disease characterized by a peculiar eruption; variola. The cutaneous eruption is at first a collection of papules which become vesicles ( first flat, subsequently umbilicated) and then pustules, and finally thick crusts which slough after a certain time, often leaving a pit, or scar.

Synonyms:

variola major virus, variola, bilharzia, cowpox, the pox, variola major, AIDS, chickenpox, the Black Death, disease, bubonic plague, bird flu, chlamydia, amoebic dysentery, avian flu, black lung

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