1. The clear yellowish fluid obtained upon separating whole blood into its solid and liquid components. Also called blood serum.
2. Blood serum from the tissues of immunized animals, containing antibodies and used to transfer immunity to another individual.
3. Watery fluid from animal tissue, such as that found in edema.

Excerpted from The American Heritage Dictionary of the English Language, Third Edition Copyright © 1992 by Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V., further reproduction and distribution restricted in accordance with the Copyright Law of the United States. All rights reserved.

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