noun
Japanese oak silkmoth
A species of silkmoth native to Japan; scientific name Antheraea yamamai. The name is often written in katakana.
See also: 山繭
ヤママユガの繭は緑色をしている。
The cocoon of the Japanese oak silkmoth is green.
Refers to the cocoon of the Japanese oak silkmoth, while ヤママユガ refers to the moth itself.
Compound of 山 (yama, 'mountain') + 繭 (mayu, 'cocoon') + 蛾 (ga, 'moth'). The exact historical derivation is uncertain, but the name likely refers to the moth's habitat and its silk-producing cocoon.