拱墩

拱墩	gǒng dūn	pillar of a vault
拱	gǒng	to cup one's hands in salute / to surround / to arch / to dig earth with the snout / arched
墩	dūn	block / gate pillar / pier / classifier for clusters of plants / classifier for rounds in a card game: trick / (archaic) watchtower
墩	dūn	old variant of 墩