noun A pipe, tube or canal which carries gas or liquid from one place to another.
heating and air-conditioning ducts
noun An enclosure or channel for electrical cable runs, telephone cables, or other conductors.
noun A vessel for conveying lymph or glandular secretions such as tears or bile.
noun A tube or elongated cavity (such as a xylem vessel) for conveying water, sap, or air.
noun A layer (as in the atmosphere or the ocean) which occurs under usually abnormal conditions and in which radio or sound waves are confined to a restricted path.
noun Guidance, direction.
verb To enclose in a duct.
verb To channel something (such as a gas) or propagate something (such as radio waves) through a duct or series of ducts.