noun, verb, -nalled or -naled, -nal⋅ling or -nal⋅ing.| 1. | an artificial waterway for navigation, irrigation, etc. |
| 2. | a long narrow arm of the sea penetrating far inland. |
| 3. | a tubular passage or cavity for food, air, etc., esp. in an animal or plant; a duct. |
| 4. | channel; watercourse. |
| 5. | Astronomy. one of the long, narrow, dark lines on the surface of the planet Mars, as seen telescopically from the earth. |
| 6. | to make a canal through. |
canal ca·nal (kə-nāl')
n.
A duct, a channel, or a tubular structure.