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Definition of antibody : Any of various bodies or substances in the blood which act in antagonism to harmful foreign bodies, as toxins or the bacteria producing the toxins. Normal blood serum apparently contains variousantibodies, and the introduction of toxins or of foreign cells also results in the development of their specific antibodies.

Synonyms:

immune response or defense, gamma globulin, neutralizer, immunoglobulin

Usage examples:

• The Mentorian said briefly, We wish to check on the proper antibody component for Aldebaran natives. - "The Colors of Space", Marion Zimmer Bradley.
• Another Med Ship man would have considered that Calhoun had had Murgatroyd prepare a splendid small sample of antibody- containing serum, in case something got out of hand. - "This World Is Taboo", Murray Leinster.