• synonyms


[si-roh-suh, -zuh]
noun, plural se·ro·sas, se·ro·sae [si-roh-see, -zee] /sɪˈroʊ si, -zi/.
  1. Embryology, Zoology.
    1. the chorion.
    2. a similar membrane in insects and other lower invertebrates.
  2. serous membrane.
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Origin of serosa

1885–90; < New Latin serōsa, feminine of serōsus, equivalent to Latin ser(um) serum + -ōsus -ose1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for serosa

Historical Examples

  • Indusium: the case made by an insect larva: a membranous layer of the embryo of Locustidae below the serosa.

    Explanation of Terms Used in Entomology

    John. B. Smith

  • Serosa: the outer membrane that envelops the forming embryo, the amnion and the remainder of the egg.

  • Ventral plate: a thickening of the blastoderm of an egg from which the embryo, but not the amnion or serosa is formed.

British Dictionary definitions for serosa


  1. another name for serous membrane
  2. one of the thin membranes surrounding the embryo in an insect's egg
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Word Origin

C19: from New Latin, from serōsus relating to serum
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

serosa in Medicine


(sĭ-rōsə, -zə)
n. pl. se•ro•sas
  1. serous membrane
  2. The chorion of a bird or reptile embryo.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.