穹窿

[qióng lóng]

• fornix
• cove
• vault
• arch
• dome
• arched ceiling
• coving

例句

1. 拱楔块用于形成拱或穹窿的曲线部分的楔形石头中的一块
   One of the wedge-shaped stones forming the curved parts of an arch or a vaulted ceiling.