noun
ailanthus silkmoth; cynthia moth
Refers to the moth species Samia cynthia, whose larvae feed on ailanthus leaves. The name is usually written in katakana as シンジュサン.
シンジュサンは、ニワウルシの葉を食べる大型の蛾です。
The ailanthus silkmoth is a large moth that eats the leaves of the tree of heaven.
公園でシンジュサンの繭を見つけた。
I found a cynthia moth cocoon in the park.
The Japanese name シンジュサン (神樹蚕) literally means 'god-tree silkworm', referring to the ailanthus tree (神樹) whose leaves the larvae eat. The exact historical derivation is uncertain, but the name is descriptive of its host plant.