noun
1.
a. or egg capsule : a protective case enclosing eggs (as of certain insects and mollusks) : ootheca — see sea necklace
b. or egg sac : a pouch of spun silk in which many spiders carry their eggs
c. : a highly specialized outer envelope that encloses an egg and that is either soft and gelatinous (as in certain amphibians) or strong and horny with special adaptations for the escape of the young (as in skates) — see sea purse
2. : a container (as of cardboard) for marketing eggs