JMdict: 1208250

括約筋 【かつやくきん】

  1. [adj-na,n] sphincter; sphincter muscle; constrictor
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
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