Rh blocking serum

Rh blocking serum

[¦är¦āch ¦bläk·iŋ ‚sir·əm]
(immunology)
A serum that reacts with Rh-positive blood without causing agglutination, but which blocks the action of anti-Rh serums that are subsequently introduced.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.