Retroviridae

[rĕt′rō-vîrĭ-dē′]
n.
  1. A family of viruses, many of which produce tumors, that contain RNA and reverse transcriptase, including the virus that causes AIDS.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.