egg sac

noun
a silken case or capsule containing eggs of a female spider.
Also called egg case.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
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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Example sentences
As you get too big to fit inside, pretend to be an egg sac.
Eggs are also yellowish and laid in a cottony egg sac.
Newly hatched diamondback terrapin with egg sac and egg tooth.
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