Japanese symbol for “fibrillation”

細動

さいどう

Romaji: saidou

fibrillation

In Japanese, fibrillation is 細動, read さいどう (saidou).

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 fibrillation

Kanji and stroke order

細

dainty, get thin, taper

on: サイ
kun: ほそ.い、ほそ.る、こま.か、こま.かい

11 strokes · JLPT 2

動

move, motion, change

on: ドウ
kun: うご.く、うご.かす

11 strokes · JLPT 3

Related words

Words that share a kanji.

Word	Reading	Meaning
詳細	しょうさい shousai	details; particulars; specifics
細胞	さいぼう saibou	cell
細かい	こまかい komakai	small
細菌	さいきん saikin	bacterium; bacteria; germ
細い	ほそい hosoi	thin; slender; fine
繊細	せんさい sensai	dainty; delicate (e.g. fingers); fine
活動	かつどう katsudou	activity (of a person, organization, animal, volcano, etc.); action; operation
行動	こうどう koudou	action; conduct; behaviour

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.