拱顶

拱顶	gǒng dǐng	an arched roof / a dome / a vault
拱	gǒng	to cup one's hands in salute / to surround / to arch / to dig earth with the snout / arched
顶	dǐng	apex / crown of the head / top / roof / most / to carry on the head / to push to the top / to go against / to replace / to substitute / to be subjected to (an aerial bombing, hailstorm etc) / (slang) to "bump" a forum thread to raise its profile / classifier for headwear, hats, veils etc