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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 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Breast tissue in these animals grew abnormally, creating many branching mammary ducts of a type usually seen only in pregnant mice, says Eva Y. The remarkable similarity in the microscopic features of salivary duct carcinomas and mammary duct carcinomas further raises questions as to whether these tumors share antigenic or hormonal features. It continues to be expressed in the mammary gland of the pubescent rodent and is localized to the mammary ducts and developing lobules (Hushka et al. |
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