- any tube, canal, pipe, or conduit by which a fluid, air, or other substance is conducted or conveyed.
- Anatomy, Zoology. a tube, canal, or vessel conveying a body fluid, especially a glandular secretion or excretion.
- Botany. a cavity or vessel formed by elongated cells or by many cells.
- Electricity. a single enclosed runway for conductors or cables.
- Printing. (in a press) the reservoir for ink.
- to convey or channel by means of a duct or ducts: Heat from the oven is ducted to the outside.
Origin of duct
Examples from the Web for ductless
Secretions in ductless and sac filling glands are for reabsorption.The White Spark
Orville Livingston Leach
At the present time the tendency among some writers is to make the ductless glands the responsible agents in almost all diseases.Arteriosclerosis and Hypertension:
Louis Marshall Warfield
As I hadn't the faintest idea what a ductless gland was I continued silent.The Tower of Oblivion
It is a "ductless" gland, its secretions apparently being taken up by absorption into the lymph, and from that into the blood.Vitality Supreme
This behavior is caused by the capture, storage and release of energy through the ductless glands.Crime: Its Cause and Treatment
- a tube, pipe, or canal by means of which a substance, esp a fluid or gas, is conveyed
- any bodily passage, esp one conveying secretions or excretions
- a narrow tubular cavity in plants, often containing resin or some other substance
- Also called: conduit a channel or pipe carrying electric cable or wires
- a passage through which air can flow, as in air conditioning
- the ink reservoir in a printing press
Word Origin and History for ductless
1640s, "course, direction," from Latin ductus "a leading," past participle of ducere "to lead" (see duke (n.)). Anatomical sense is from 1660s. Meaning "conduit, channel" is 1713; that of "air tube in a structure" is from 1884.
- Lacking a duct, as glands that only secrete internally.
- A tubular bodily canal or passage, especially one for carrying a glandular secretion such as bile.
- A tube or tubelike structure through which something flows, especially a tube in the body for carrying a fluid secreted that is by a gland.