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a long and artificial passage built and filled with water for ships to travel along or used to transfer water to other places
a tubular passage in the body through which air, liquid or food can pass
What is a "canal"?
A canal refers to a tubular passageway or channel that exists within various anatomical structures. Canals serve important functions in the body, such as facilitating the passage of fluids, substances, or structures. They can be found in different regions, including the ears (eustachian canal), the spinal cord (central canal), and the digestive system (intestinal canal). Canals play a crucial role in maintaining the proper functioning of the body by allowing the transportation of essential substances, providing pathways for nerve fibers, or facilitating the drainage of fluids.
(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion