瞳孔括約筋

Reading

Kana: どうこうかつやくきん

Romaji: doukoukatsuyakukin

Definition

noun

1

sphincter muscle of the pupil; sphincter pupillae

(Anatomical term)

Kanji

瞳

Readings: ドウ、 トウ、 ひとみ

Meaning: pupil (of eye)

孔

Readings: コウ、 あな

Meanings: cavity, hole, slit, very, great, exceedingly

括

Readings: カツ、 くく.る

Meanings: fasten, tie up, arrest, constrict

約

Readings: ヤク、 つづ.まる、 つづ.める、 つづま.やか

Meanings: promise, approximately, shrink

筋

Readings: キン、 すじ

Meanings: muscle, sinew, tendon, fiber, plot, plan, descent