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[seer-uh m] /ˈsɪər əm/
noun, plural serums, sera
[seer-uh] /ˈsɪər ə/ (Show IPA)
the clear, pale-yellow liquid that separates from the clot in the coagulation of blood; blood serum.
any watery animal fluid.
the thin, clear part of the fluid of plants.
milk whey.
Origin of serum
1655-65; < Latin: whey
Related forms
serumal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for serumal


noun (pl) -rums, -ra (-rə)
antitoxin obtained from the blood serum of immunized animals
(physiol, zoology) clear watery fluid, esp that exuded by serous membranes
a less common word for whey
Derived Forms
serumal, adjective
Word Origin
C17: from Latin: whey
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for serumal



1670s, "watery animal fluid," from Latin serum "watery fluid, whey," from PIE root *ser- (2) "to run, flow" (cf. Greek oros "whey;" Sanskrit sarah "flowing," sarit "brook, river"). First applied 1893 to blood serum used in medical treatments.

Online Etymology Dictionary, © 2010 Douglas Harper
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serumal in Medicine

serumal se·rum·al (sēr'ə-məl)
Relating to or derived from serum.

serum se·rum (sēr'əm)
n. pl. se·rums or se·ra (sēr'ə)

  1. A watery fluid, especially one that moistens the surface of serous membranes or that is exuded by such membranes when they become inflamed.

  2. The clear yellowish fluid obtained upon separating whole blood into its solid and liquid components.

  3. Such fluid from the tissues of immunized animals, containing antibodies and used to transfer immunity to another individual.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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serumal in Science
Plural serums or sera
  1. See blood serum.

  2. Blood serum extracted from an animal that has immunity to a particular disease. The serum contains antibodies to one or more specific disease antigens, and when injected into humans or other animals, it can transfer immunity to those diseases.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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