Definitions
1.nounAn artificial waterway or artificially improved river used for travel, shipping, or irrigation.
2.nounA tubular channel within the body.
3.nounOne of the faint, hazy markings resembling straight lines on early telescopic images of the surface of Mars.
4.verbTo dig an artificial waterway in or to (a place), especially for drainage
5.verbTo travel along a canal by boat