duct

noun

1. A pipe, tube or canal which carries gas or liquid from one place to another.

   “heating and air-conditioning ducts”

   “The three motors on each bogie are force ventilated from a blower mounted in the adjacent nose-end compartment of the superstructure, the air being led by ducts and flexible bellows connections to the air inlet at the commutator end of the motor.”

2. A pipe, tube or canal which carries gas or liquid from one place to another.
3. A pipe, tube or canal which carries gas or liquid from one place to another.
4. A pipe, tube or canal which carries gas or liquid from one place to another.
5. 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.
6. (obsolete)Guidance, direction.

   “[…] otherwise to express His care and love to mankind, viz., in giving and consigning to them His written word for a rule and constant director of life, not leaving them to the duct of their own inclinations.”

verb

1. (transitive)To enclose in a duct.
2. (transitive)To channel something (such as a gas) or propagate something (such as radio waves) through a duct or series of ducts.