entries → 灸
TSUMUGU · TOCFL C1 (est.) · 字
灸 character · TOCFL C1 (est.)
灸 ＝ 火 ＋ 久
ㄐㄧㄡˇ · jiǔ
noun/verb — moxibustion; to cauterize with burning moxa

字源 FORM — what the parts do

火義fire
久聲jiǔ — gives the soundthe graph for a long time, sitting plainly on top
Fire (火) under 久 jiǔ, the sound — an exact match, no drift. The word is moxibustion: smouldering moxa held to a point on the skin for a long while. 火 is the burning; 久 is both the sound and a fitting picture of how long the heat is held. It pairs with the needle in 針灸.

故事 STORY — a scene to remember it by

一撮艾草在皮膚上久久地（久）燒著（火）——那股暖，就是灸。
A pinch of moxa held burning (火) against the skin for a long while (久) — that lasting heat is moxibustion.
字源記憶法
意 · Meanings
(本義)艾灸— moxibustion — burning moxa on a point常用
→針灸— acupuncture-and-moxa常用
→灸療— moxa treatment
(本義) original meaning · → ⇒ each arrow = one more step of extension
關 · Related
久jiǔits sound half — 久 alone is duration, 灸 sets fire under it疚jiùthe sibling in the 久 series — 疚 takes 疒 for an ache, 灸 takes 火