The word duct is derived from the Latin word for ''led/leading''. It may refer to: *

Duct (anatomy) In anatomy and physiology, a duct is a circumscribed channel leading from an exocrine gland or organ. Types of ducts Examples include: Duct system As ducts travel from the acinus which generates the fluid to the target, the ducts become la ...

, various ducts in anatomy and physiology **

Tear duct The nasolacrimal duct (also called the tear duct) carries tears from the lacrimal sac of the eye into the nasal cavity. The duct begins in the eye socket between the maxillary and lacrimal bones, from where it passes downwards and backwards. The o ...

, which carry tears to the eyes *

Duct (HVAC) Ducts are conduits or passages used in HVAC, heating, ventilation, and air conditioning (HVAC) to deliver and remove air. The needed airflows include, for example, ''supply air'', ''return air'', and ''exhaust air''. Ducts commonly also deliver ...

, for transfer of air between spaces in a structure *

Duct tape Duct tape or duck tape is cloth- or scrim-backed pressure-sensitive tape, often coated with polyethylene. A variety of constructions exist using different backings and adhesives, and the term "duct tape" has been genericized to refer to all o ...

, a kind of adhesive tape *

Ducted fan In aeronautics, a ducted fan is a thrust-generating mechanical fan or Propeller (aeronautics), propeller mounted within a cylindrical wiktionary:duct, duct or shroud. Other terms include ducted propeller or shrouded propeller. When used in vertic ...

, motor for aircraft * Electrical bus duct, a metal enclosure for

busbar In electric power distribution, a busbar (also bus bar) is a metallic strip or bar, typically housed inside switchgear, panel boards, and busway enclosures for local high current power distribution. They are also used to connect high volt ...

s *

Duct (industrial exhaust) Industrial exhaust ducts are pipe systems that connect hoods to industrial chimneys through other components of exhaust systems like fans, collectors, etc. Ducts are low-pressure pneumatic conveyors to convey dust, particles, shavings, fumes, or c ...

, industrial exhaust duct system designed for low pressure-pneumatic convey of gas, fumes, dusts, shavings, and other pollutants from works space to atmosphere after cleaning and removal of contaminants *

Atmospheric duct In telecommunications, an atmospheric duct is a horizontal layer in the lower atmosphere in which the vertical refractive index gradients are such that radio signals (and light rays) are guided or ducted, tend to follow the curvature of the Ear ...

, a horizontal layer in the lower atmosphere in which the vertical refractive index gradients are such that radio signals (a) are guided or ducted, (b) tend to follow the curvature of the Earth, and (c) experience less attenuation in the ducts than they would if the ducts were not present **

Tropospheric ducting Tropospheric propagation describes electromagnetic propagation in relation to the troposphere. The service area from a VHF or UHF radio transmitter extends to just beyond the optical horizon, at which point signals start to rapidly reduce in st ...

, a type of radio propagation in the troposphere that allows signals to travel unusually long distances **

Earth–ionosphere waveguide The Earth–ionosphere waveguide is the phenomenon in which certain radio waves can propagate in the space between the ground and the boundary of the ionosphere. Because the ionosphere contains charged particles, it can behave as a conductor. Th ...

, a type of atmospheric duct *

Surface duct Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances (ranging), communicate with or detect objects on o ...

, a sound propagation phenomenon at sea *

Duct Publishing Omniscriptum Publishing Group, formerly known as VDM Verlag Dr. Müller, is a German publishing company, publishing group headquartered in Riga, Riga, Latvia. Founded in 2002 in Düsseldorf, its book production is based on print on demand, pri ...

, an imprint of the German group VDM Publishing devoted to the reproduction of Wikipedia content * Dispatchable Unit Control Table (DUCT) in

z/Architecture z/Architecture, initially and briefly called ESA Modal Extensions (ESAME), is IBM's 64-bit complex instruction set computer (CISC) instruction set architecture, implemented by its mainframe computers. IBM introduced its first z/Architecture ...

* Flexible Ducting

See also