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Meaning of hapten

hap•ten

Pronunciation: (hap'ten), [key]
— n. Immunol.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.