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Definition of "serum" [se•rum]

  • The clear yellowish fluid obtained upon separating whole blood into its solid and liquid components after it has been allowed to clot. Also called blood serum. (noun)
  • Blood serum from the tissues of immunized animals, containing antibodies and used to transfer immunity to another individual. (noun)
  • Watery fluid from animal tissue, such as that found in edema. (noun)
  • Whey. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "serum" in a sentence
  • "They made what they called a serum, which they put into a man's body and which killed the pantoblast germs without killing the man."
  • "Fetal bovine serum is highly diluted and eventually removed from cells during the growth of vaccine viruses."
  • "Fetal bovine serum is used in the manufacture of vaccines."