Definitions for "Canal"
An artificial channel filled with water and designed for navigation, or for irrigating land, etc.
A constructed open channel for transporting water from the source of supply to the point of distribution.
An artificial or manmade waterway; a big ditch filled with water
A tube or duct; as, the alimentary canal; the semicircular canals of the ear.
A long and relatively narrow arm of the sea, approximately uniform in width; -- used chiefly in proper names; as, Portland Canal; Lynn Canal.
Pertains to the root canal, which is a duct within the tooth root, containing nerves and blood vessels.
groove or notch.  In gastropods, the anterior or siphonal canal is a tough-like forward extension of the columella, through which  the siphon or breathing tube is extended.  The posterior or anal canal is a notch in the outer lip near the suture.
Perforation, or foramen, that tends to be elongated into a tube. Examples are alisphenoid canal, infraorbital canal.
a rio , and an alleyway that cuts through a building is a sottoportico or sottoportego , to give its dialect version
Taken from Encyclopaedia Britannica 2002
A totally man-made waterbody; does not include streams that have been modified by dredging or straightening.
Keywords:  penstock, flume, open, closed, example
an example of an open flume and a penstock in an example of a closed flume
Keywords:  noun
Keywords:  excavated, greek, derives, length, flow
a place excavated throughout its length, and derives its name from a Greek word meaning to flow
Keywords:  city, provide
provide (a city) with a canal