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n. pl. an·ti·se·rums or an·ti·se·ra (-sîr′ə)
Human or animal serum containing antibodies that are specific for one or more antigens.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
These are inoculations containing antibodies to a specific infection.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited