Picornaviridae

[pē-kôr′nə-vîrĭ-dē]
n.
  1. A family of very small nonenveloped viruses having a core of single-stranded RNA and including the polioviruses, coxsackieviruses, and echoviruses.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.