hapten

noun Immunology.

1. a substance having a single antigenic determinant that can react with a previously existing antibody but cannot stimulate more antibody production unless combined with other molecules; a partial antigen.

noun

1. immunol an incomplete antigen that can stimulate antibody production only when it is chemically combined with a particular protein

n.

1. A substance that is capable of reacting with a specific antibody but cannot induce the formation of antibodies unless bound to a carrier protein or other molecule.incomplete antigen partial antigen