To travel along a canal by boat
To dig an artificial waterway in or to (a place), especially for drainage
A tubular channel within the body.
An artificial waterway or artificially improved river used for travel, shipping, or irrigation.
One of the faint, hazy markings resembling straight lines on early telescopic images of the surface of Mars.
To surround with a moat.
A clear ring outside the eyewall of a tropical cyclone.
An aspect of a business which makes it more "defensible" from competitors, because of the nature of its products, services or franchise or for some other reason.
A circular lowland between a resurgent dome and the walls of the caldera surrounding it.
A deep, wide defensive ditch, normally filled with water, surrounding a fortified habitation.