noun, plural an·ti·se·rums, an·ti·se·ra [an-tuh-seer-uh] /ˈæn təˌsɪər ə/.

  1. a serum containing antibodies, as antitoxins or agglutinins, obtained by inoculation of animals and used for injection into other animals to provide immunity to a specific disease.

noun plural -rums or -ra (-rə)

  1. blood serum containing antibodies against a specific antigen, used to treat or provide immunity to a disease


  1. A serum containing antibodies that are specific for one or more antigens.immune serum

Plural antiserums antisera

  1. Human or animal serum containing one or more antibodies that are specific for one or more antigens and are administered to confer immunity. The antibodies in an antiserum result from previous immunization or exposure to an agent of disease. See also acquired immunity.

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