egg sac

American  

noun

1. a silken case or capsule containing eggs of a female spider.

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egg sac Scientific  

1. The silken pouch in which many spiders deposit their eggs.

2. Also called egg case

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Example Sentences

The organism’s various states of evolution — as an egg sac or the Facehuggers that hatch from them — are back too.

From Los Angeles Times

The female will then store the sperm in structures called spermathecae and eventually construct an egg sac where the eggs remain until they hatch the following spring or summer, said Sarah Crews, from the California Academy of Sciences’ department of entomology.

From Los Angeles Times

One egg sac can carry hundreds of eggs.

From Salon

It can also spread when the spiderlings first hatch from the egg sac.

From Washington Post

Like the praying mantis who's male through the whole thing, and then has this egg sac, but Mom and I still call it "he."

From Salon