smallpox

n. contagious disease characterized by skin eruptions which often leave permanent scars

Smallpox (also known by the Latin names Variola or Variola vera) is a contagious disease unique to humans. Smallpox is caused by either of two virus variants named Variola major and Variola minor. The deadlier form, V. major, has a mortality rate of 30–35%, while V. minor causes a milder form of disease called alastrim and kills ~1% of its victims. Long-term side-effects for survivors include the characteristic skin scars. Occasional side effects include blindness due to corneal ulcerations and infertility in male survivors.
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Smallpox is an infection caused by the variola virus, a member of the poxvirus family. [more]Smallpox - Community and Resources

Noun
1. a highly contagious viral disease characterized by fever and weakness and skin eruption with pustules that form scabs that slough off leaving scars
(synonym) variola, variola major
(hypernym) pox
(hyponym) alastrim, variola minor, pseudosmallpox, pseudovariola, milk pox, white pox, West Indian smallpox, Cuban itch, Kaffir pox
(part-meronym) pock

(n.)
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.