noun
Scolopendra subspinipes; giant centipede
Refers specifically to the species Scolopendra subspinipes, a large venomous centipede found in East Asia.
オオムカデは日本最大のムカデです。
The Scolopendra subspinipes is the largest centipede in Japan.
夜、オオムカデが家の中に入ってきた。
At night, a giant centipede came into the house.
ムカデ is the general term for centipedes, while オオムカデ refers to a specific large species.
Compound of 大 (おお, 'big') and ムカデ (むかで, 'centipede'). The exact origin of ムカデ is uncertain, but it is a native Japanese word.