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 ?
We first demonstrated the ligation of the mouse lacrimal excretory duct to investigate whether the procedure could cause LG injury (Figure 1(a)).
Salivary duct carcinoma is an aggressive malignant epithelial tumor arising from intralobular and interlobular excretory ducts. It resembles high-grade breast ductal carcinoma and demonstrates ductal, papillary, solid, and cribriform with comedo necrosis growth patterns.
Excretory duct/main excretory duct (ED/MED): These are characterized as being covered by a simple columnar epithelium with eosinophil cytoplasm cells with few basal striations (Fig.
Since squamous differentiation is present, excretory ducts have also been implicated as the site of origin.
On P4W, while no immunoreactivity was maintained in the acinar cells, distinct immunoreactivity was seen in ductal cells throughout the intercalated, granular and striated portions of the distal ducts as well as the proximal excretory ducts (Fig.
DISCUSSION: Ranula occurs because of rupture of the excretory duct resulting in extravasation of mucous in surrounding tissue leading to formation of pseudo cyst.
(7, 8, 9) The cyst is in continuity with the salivary gland excretory duct. Tumor does not proliferate beyond the cyst wall.
(5) NH is a benign tumor of skin appendages that arises from the distal excretory duct of eccrine sweat glands on the skin of head, face and upper extremities.
In other mammalian species as rat (Butcher, 1972 and Kim, 1976) and mouse (Matsuoka et al., 1994), a salivary reservoir is found near the oral end of the main excretory duct (MED) of the submandibular gland; a similar structure exist in the MED of the mouse sublingual gland (Matsuoka et al., 1993).