Vocabulary What does 重油 (じゅうゆ, juuyu) mean? 重油 (じゅうゆ, juuyu) means heavy oil; fuel oil. Quick factsReadingじゅうゆRomajijuuyuPart of speechnoun 重油じゅうゆjuuyuheavy oil; fuel oil1noun heavy oil; fuel oilKanji in this word重heavy; important油oil