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CANAL, noun

1. A passage for water; a water course; properly, a long trench or excavation in the earth for conducting water, and confining it to narrow limits; but the term may be applied to other water courses. It is chiefly applied to artificial cuts or passages for water, used for transportation; whereas channel is applicable to a natural water course.

The canal from the Hudson to Lake Erie is one of the noblest works of art.

2. In anatomy, a duct or passage in the body of an animal, through which any of the juices flow, or other substances pass; as the neck of the bladder, and the alimentary canal

3. A surgical instrument; a splint.