n :  the portion of the range of concentration of antibody-antigen mixtures in which one of them although present in excess does not produce its characteristic effect (as agglutination or precipitation) .
 
 
 
Similar sounding terms:  hy·per·i·cin  per·so·na  por·cine  pyr·azine 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2004.