/ˌpīrōˈmānyäk/
The police are looking for a pyromaniac who has been setting fires all over the city.
警察は、街中で放火を繰り返している放火魔を探しています。
He is a pyromaniac who has been arrested for arson several times.
彼は放火で何度も逮捕された放火魔です。