noun
brown widow; grey widow; brown button spider
A spider species (Latrodectus geometricus) known as the brown widow, grey widow, or brown button spider. The Japanese name literally means 'grey widow spider'.
灰色後家蜘蛛は、日本では外来種として知られている。
The brown widow is known as an invasive species in Japan.
ハイイロゴケグモの毒は、クロゴケグモほど強くない。
The venom of the brown widow is not as potent as that of the black widow.
Compound of 灰色 (はいいろ, 'grey') + 後家 (ごけ, 'widow') + 蜘蛛 (くも, 'spider'), calque of the English 'grey widow'.