also: おおゴキブリ
noun
Panesthia spadica (species of cockroach)
A specific species of cockroach; the name is usually written in katakana. This is a biological term, not a general word for a large cockroach.
オオゴキブリは朽ち木の中で見つかることがある。
Panesthia spadica can sometimes be found inside rotting wood.
ゴキブリ is the general term for cockroach, while オオゴキブリ refers specifically to the species Panesthia spadica.
Compound of 大 (おお, 'large') and ゴキブリ (cockroach). The exact derivation of ゴキブリ is uncertain; it may be related to 御器 (ごき, 'bowl') and かぶり (covering), but this is not firmly established.