General English

General Science

  • noun a channel or tube through which things such as fluids or cables can pass
  • noun a narrow passageway in a gland or bladder through which fluid leaves

Cars & Driving

  • noun a passage in square-section or tubular form for ventilation, heating or cables


  • noun a pipe containing cables, providing a tidy and protective surrounding for a group of cables


  • In electrical systems, an enclosure for wires or cables, often embedded in concrete floors or encased in concrete underground.
  • In HVAC systems, the conduit used to distribute the air.
  • In post-tensioning, the hole through which the cable is pulled.


  • A pipe, tube, or channel through which a substance or waves are conveyed or propagated. When referring to a pipe or tube with precise dimensions, through which microwave energy is transmitted, also called waveguide (2).
  • A pipe, tube, or channel through which lines, cables, or wires are run.
  • Within the troposphere, a layer which, depending on the temperature and humidity conditions, may act as a waveguide for the transmission of radio waves for extended distances. Also called atmospheric duct, tropospheric duct, or wave duct (2).
  • A narrow layer that forms under unusual conditions in the atmosphere or ocean, and which serves to propagate radio waves or sound waves. Also called wave duct (3).


  • noun a tube which carries liquids, especially one which carries secretions


  • noun a container for ink in a printing machine

Real Estate

  • noun a tube or channel through which something such as air flows or something such as a pipe or cable is laid
  • verb to supply or equip something such as a building with a duct or a system of ducts

Origin & History of “duct”

Duct comes from Latin ductus, a noun formed from the past participle of the verb dūcere ‘lead’. this is among the most prolific Latin sources of English words. It appears in numerous prefixed forms, all containing to some extent the underlying meaning element ‘lead’, such as deduce, introduce, produce, and reduce, as well as educate and, in less obvious form, subdue. Its past participle produced aqueduct and ductile (14th c.), not to mention (via vulgar Latin *ductiāre and Italian docciare) douche (18th c.). And furthermore it comes ultimately from the same Indo-European source as produced English team, teem, tie, tight, tow, and tug.