antiserum an·ti·se·rum (ān'tĭ-sēr'əm)
A serum containing antibodies that are specific for one or more antigens. Also called immune serum.
Plural antiserums or antisera
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.