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A protective capsule of certain animals, such as insects and mollusks, that contains eggs.
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See egg sac
Etymology
Origin of egg case
First recorded in 1840–50
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
To capture the full picture, the research team monitored five female sharks before, during and after egg case formation.
From Science Daily • Jan. 21, 2026
A small hole in its base led the researchers to speculate it may be egg case or a dead sponge attachment.
From DOGO News • Sep. 18, 2023
Everyone who approaches the egg case a Hy-Vee grocery store in Omaha, “has a sour face,” said shopper Nancy Stom.
From Seattle Times • Jan. 10, 2023
The shark egg case has tentacles that snag in seaweed and give the newborn shark cover.
From Textbooks • Apr. 25, 2013
As she got closer to the thing on the wall, she saw that it was some kind of a sac, like a spider’s egg case.
From "Coraline" by Neil Gaiman
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
