a silken case or capsule containing eggs of a female spider.
- Also called egg case.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use egg sac in a sentence
Long before Tyrannosaurus rex walked the Earth, sap engulfed a spider guarding her egg sac.This is the oldest fossil evidence of spider moms taking care of their young | Freda Kreier | September 27, 2021 | Science News
A characteristic feature is the white corrugated egg-sac attached to the end of the body (Fig. 5).Garden Pests in New Zealand | D. Miller
A lycosid spider (Pardosa lapidicina) carrying an egg sac was basking on an inclined rock surface.Life History and Ecology of the Five-lined Skink, Eumeces fasciatus | Henry S. Fitch
In the specimen figured, the egg-sac was concealed in the upper part of the web.
Fig. 108 represents the large egg-sac of one of the orb weavers.
These eggs hatch early in the winter; but no spiders emerge from the egg-sac until the following spring.
Scientific definitions for egg sac
The silken pouch in which many spiders deposit their eggs. Also called egg case
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.