brood cocoon

Noun

(biology, arachnology) A cocoon-like structure made of web in which a female spider lays her eggs.

Japanese Meaning

雌蜘蛛が卵を産むために、巣状の糸で作る、さなぎのような構造物

The female spider guarded the brood cocoon until the spiderlings hatched.

雌のクモは子グモが孵化するまで卵嚢を守った。

Sense（1）

(biology, arachnology) A cocoon-like structure made of web in which a female spider lays her eggs.

brood cocoons

（ plural ）