noun
Dated and sensitive term for cleft lip. Modern medical contexts prefer 口唇裂 (こうしんれつ).
See also: 口唇裂
昔は「三つ口」と呼ばれた先天性の症状は、現在では口唇裂として知られている。
The congenital condition once called 'mitsukuchi' is now known as cleft lip.
Modern, neutral medical term for cleft lip, replacing the dated and sensitive 三つ口.
The term 三つ口 literally means 'three mouths', likely referring to the appearance of a cleft lip. The alternative spelling 兎唇 ('rabbit lip') is a direct visual comparison. The exact historical derivation is uncertain.