Definition of "duct"

a pipe, tube or canal which carries gas or liquid from one place to another

1. an enclosure or channel for electrical cable runs, telephone cables, or other conductors  examples

2. (anatomy) a vessel for conveying lymph or glandular secretions such as tears or bile  examples

3. (botany) a tube or elongated cavity (such as a xylem vessel) for conveying water, sap, or air  examples

(physics) 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  examples

(obsolete) guidance, direction  quotations

to enclose in a duct  examples

to channel something (such as a gas) or propagate something (such as radio waves) through a duct or series of ducts  examples