a tunnel that carries a river or a pipe for water under a road 涵（洞）；（道路下面的）排水管 Culverts ran the entire length of the building. 涵洞贯穿了整个建筑物。 The culvert seemed to be disused and silted up with debris. 涵洞似乎已废弃，并被碎屑淤塞。
Word Originlate 18th cent.: of unknown origin.