Orthopoxvirus

[ôr′thō-pŏksvī′rəs]

n.

A genus of poxviruses that includes the viruses that cause smallpox and cowpox.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.