neutralizing antibody

[ nōōtrə-lī′zĭng ]

n.

An antibody that reacts with an infectious agent, usually a virus, and destroys or inhibits its infectiveness and virulence.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.