vitelline membrane

noun
the membrane surrounding the egg yolk.

Origin:
1835–45

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World English Dictionary
vitelline membrane (vɪˈtɛlɪn, -aɪn)
 
n
zoology a membrane that surrounds a fertilized ovum and prevents the entry of other spermatozoa

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American Heritage
Medical Dictionary

vitelline membrane n.

  1. The membrane enveloping the yolk of an egg. Also called ovular membrane, yolk membrane.

  2. The pellucid zone of a mammalian ovum. Also called yolk membrane.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Eggs from treated birds are described as mottled in appearance, reflecting a porous vitelline membrane.
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