duct

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duct

1. any bodily passage, esp one conveying secretions or excretions
2. a narrow tubular cavity in plants, often containing resin or some other substance
3. a channel or pipe carrying electric cable or wires
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Duct

A nonmetallic or metallic tube for housing wires or cables, may be underground or embedded in concrete floor slabs; a duct usually fabricated of metal, used to transfer air from one location to another.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

duct

[dəkt]
(anatomy)
An enclosed tubular channel for conducting a glandular secretion or other body fluid.
(communications)
An enclosed runway for cables.
(geophysics)
The space between two air layers, or between an air layer and the earth's surface, in which microwave beams are trapped in ducting. Also known as radio duct; tropospheric duct.
(mechanical engineering)
A fluid flow passage which may range from a few inches in diameter to many feet in rectangular cross section, usually constructed of galvanized steel, aluminum, or copper, through which air flows in a ventilation system or to a compressor, supercharger, or other equipment at speeds ranging to thousands of feet per minute.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

duct

1. ,See air duct.
2. In electric systems, a metallic or nonmetallic tube, (usually circular, oval, rectangular, or octagonal) for housing wires or cables; may be underground or embedded in concrete floor slabs.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

duct

A thin-wall tube installed in aircraft air-conditioning and heating systems to carry heated or cooled air for distribution to various aircraft locations.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
The maximal tension developed ([E.sub.max], in grams of tension, g) and the potency of NE and CCh in inducing epididymal duct tension (expressed as [pEC.sub.50] the -log of NE and CCh concentration inducing 50% of maximal tension) were evaluated.
In Vitro Tension of the Isolated Epididymal Duct of Untreated Animals Exposed to [As.sub.2][O.sub.3] In Vitro.
The most complex condition, found in the Ambystomatidae, Hynobiidae, Proteidae, Salamandridae, and Siren idae, consists of the following ducts leading from the testes sequentially: the vasa efferentia, Bidder's duct (longitudinal collecting duct), afferent epididymal ducts, and efferent epididymal ducts.
Distal to the renal corpuscles, the lumina decrease in size due to the increase in size of the epithelium lining the epididymal ducts (Figs.
The efferent ductules start from each testicle, forming the epididymal ducts after converging, which are elongated and convoluted (CABRAL et al., 2011).
These regional variations were confirmed in the present study showing differences in total protein expression in the epididymal duct of the Golden hamster.
In addition, one can suppose the occurrence of a possible continuous renewal of glycoproteins on the surface of epididymal duct cells as postulated by Vicentini & Orsi.
Cellular expression and localization of cytochrome P450 aromatase (Cyp19) in the male reproductive tract during the development Neonatal/ Tissue Fetal (2) Prepuberal (3) Adult (4) Testis Leydig cells + + + Sertoli cells + + + Germ cells - + + Efferent ductules (5) nd + - Epididymis Epithelial cells (6) nd + + Spermatozoa (1) np + (1) Spermatozoa present in epididymal ducts. nd = Not determined.