JMdict: 2826425

瞳孔括約筋 【どうこうかつやくきん】

  1. [n] sphincter muscle of the pupil; sphincter pupillae
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
瞳 Pupil (of Eye) ドウ, トウ ひとみ
孔 Cavity, Hole, Slit, Very, Great, Exceedingly コウ, ク あな
括 Fasten, Tie Up, Arrest, Constrict カツ くく.る
約 Promise, Approximately, Shrink ヤク つづ.まる, つづ.める, つづま.やか 4
筋 Muscle, Sinew, Tendon, Fiber, Plot, Plan, Descent キン すじ 6