Definitions
1.NounAn artificial waterway or artificially improved river used for travel, shipping, or irrigation.
2.NounA tubular channel within the body or within a plant.
3.NounOne of the faint, hazy markings resembling straight lines on early telescopic images of the surface of Mars; see Martian canals
4.VerbTo dig an artificial waterway in or to (a place), especially for drainage
5.VerbTo travel along a canal by boat