duct dQkt n [C] a tube or pipe that carries liquid or air, esp. in and out of buildings or through the body （输送液体或空气的）管道 Most office buildings have dozens of air ducts and vents. 多数办公楼都有许许多多的管道和通风口。 People with blocked tear ducts cannot cry. 泪管堵塞的人不能哭。