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egg sac

a silken case or capsule containing eggs of a female spider.
Also called egg case. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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egg sac in Science
egg sac  
The silken pouch in which many spiders deposit their eggs. Also called egg case.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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