sera Unabridged


noun, plural serums, sera [seer-uh] .
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.

1655–65; < Latin: whey

serumal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sera (ˈsɪərə)
a plural of serum

serum (ˈsɪərəm)
n , pl -rums, -ra
1.  See blood serum
2.  antitoxin obtained from the blood serum of immunized animals
3.  physiol, zoology clear watery fluid, esp that exuded by serous membranes
4.  a less common word for whey
[C17: from Latin: whey]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1672, "watery animal fluid," from L. serum "watery fluid, whey," from PIE base *ser-/*sor- "to run, flow" (cf. Gk. oros "whey;" Skt. 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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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
serum   (sîr'əm)  Pronunciation Key 
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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