noun, noun which may take the genitive case particle 'no'
egg sac; egg case; ootheca
Biological term for a protective structure containing eggs, used especially for insects, spiders, and some aquatic animals.
A spider's egg sac was attached to the underside of the leaf.
ゴキブリの卵嚢は硬い殻で覆われている。
The cockroach's ootheca is covered with a hard shell.