Japanese symbol for “dioxide”

二酸化

にさんか

Romaji: nisanka

dioxide

In Japanese, dioxide is 二酸化, read にさんか (nisanka).

Before using these characters for a tattoo, check them with a native speaker. Dictionary words often have several meanings, and the right choice depends on context.

Meanings

n, n-pref dioxide (chem)

Kanji and stroke order

二

two, two radical (no. 7)

on: ニ、ジ
kun: ふた、ふた.つ、ふたたび

2 strokes · JLPT 4

酸

acid, bitterness, sour

on: サン
kun: す.い

14 strokes · JLPT 1

化

change, take the form of, influence

on: カ、ケ
kun: ば.ける、ば.かす、ふ.ける、け.する

4 strokes · JLPT 2

Related words

Words that share a kanji.

Word	Reading	Meaning
二つ	ふたつ futatsu	two
二宮	にぐう niguu	the Two Ise Shrines
二塁打	にるいだ niruida	two-base hit; double
二塁	にるい nirui	second base
二分	にぶん nibun	halving; dividing (into two parts); bisection
一石二鳥	いっせきにちょう issekinichou	killing two birds with one stone
酸素	さんそ sanso	oxygen (O)
酸化	さんか sanka	oxidation; oxidization
文化	ぶんか bunka	culture; civilization; civilisation

See also: Chinese symbol for “dioxide”.

Data: JMdict (CC BY-SA 4.0); KANJIDIC2 (CC BY-SA 4.0); KanjiVG (CC BY-SA 3.0); wordfreq (CC BY-SA 4.0 (data)). Retrieved 2026-10-22.