- Immunology. an antibody that partly combines with an antigen and interferes with cell-mediated immunity, thereby preventing an allergic reaction.
Also called blocking factor.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- An antibody that combines with an antigen without a reaction but that blocks another antibody from later combining with that antigen.
- An immunoglobulin that combines specifically with an atopic allergen but does not elicit an allergic reaction.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.