- blood serum containing antibodies against a specific antigen, used to treat or provide immunity to a disease
WordReference Random House Unabridged Dictionary of American English © 2016
n., pl. -se•rums, -se•ra
- Drugsa 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.
- anti- + serum 1900–05