泉せん門もん

noun

fontanelle; soft spot

Anatomical term for the soft, membranous gaps between an infant's cranial bones. Used in medical and childcare contexts.

• 赤あかちゃんの泉せん門もんは、生せい後ごしばらくすると閉とじます。

  A baby's fontanelles close some time after birth.

noun

gates of Hades; entrance to the underworld

Mythological term for the entrance to the realm of the dead. Rare in modern Japanese outside literary or mythological contexts; often associated with the Chinese-derived concept of 黄泉 (よみ).

See also: 黄泉

• 泉せん門もんは、黄泉よみの国くにへ通つうじる入いり口ぐちとされる。

  The gates of Hades are said to be the entrance to the land of the dead.