TSUMUGU · A2 (est.) · 字
油
油 ＝ 氵 ＋ 由
ㄧㄡˊ · yóu
noun — oil, grease, fat
字源 FORM — what the parts do
氵義water — a flowing liquid
Once the name of a river; the everyday word borrowed it for any thick slick liquid — oil. 由 yóu carries the sound, exact. The 氵 marks it as a fluid; 由 alone is the source / "from."
故事 STORY — a scene to remember it by
水（氵）面上浮一層，怎麼也不肯混進去——亮亮的油。
A film floating on the water (氵), refusing to mix in — the bright sheen of oil.
字源記憶法
意 · Meanings
(本義)水名— the name of a river
→油、石油— oil; petroleum常用
⇒油漆、加油— paint; to refuel — anything oily or fueling
(本義) original meaning · → ⇒ each arrow = one more step of extension