～油
～ゆ · ～yu · JLPT N1 · noun
oil
🛢️ 石油 = stone + oil: the ending 油 means oil, as in 菜油 rapeseed oil
Alone, 油 is read あぶら, but as a suffix it is read ゆ, as in 灯油 (kerosene) and 原油 (crude oil). Pattern: X + 油 = oil of type X.
油 — water radical 氵 + 由 (yóu, phonetic)
油 is a phono-semantic compound. The 氵 radical signals a liquid, while 由 supplies the sound. Originally referring to a river name, it was extended to mean oil or fat — any thick, flowing liquid — which became its dominant modern sense.