also: くろゴキブリ
noun
smoky brown cockroach
A common species of cockroach in Japan, Periplaneta fuliginosa. Often simply called ゴキブリ in everyday speech.
台所でクロゴキブリを見つけた。
I found a smoky brown cockroach in the kitchen.
クロゴキブリは夜行性で、暗い場所を好む。
Smoky brown cockroaches are nocturnal and prefer dark places.
Compound of 黒 (kuro, 'black') + ゴキブリ (gokiburi, 'cockroach'). The exact origin of ゴキブリ is uncertain, but it may derive from 御器 (goki, 'bowl') + かぶり (kaburi, 'covering') or a similar mimetic expression.