noun-modifying (irregular)
sinoatrial
Anatomical term used prenominally, as in 洞房結節 (sinoatrial node).
洞房結節は心臓のペースメーカーとして働く。
The sinoatrial node acts as the heart's pacemaker.
noun
inner bedroom; brothel
Archaic. Originally referred to an inner room or bedroom; later also used euphemistically for a brothel. Not used in modern Japanese.
古文書には「洞房」を奥の寝室の意で用いた例がある。
In old documents, there are examples where 洞房 is used to mean an inner bedroom.
江戸時代の文
In Edo-period literature, 洞房 sometimes euphemistically referred to a brothel.