1. an artificial waterway constructed to allow the passage of boats or ships inland or to convey water for irrigation.Similarinland waterwaychannelwatercoursewaterwayship canal
▪ a tubular duct in a plant or animal, serving to convey or contain food, liquid, or air: "the ear canal"Similarducttubepassagevessel
▪ any of a number of linear markings formerly reported as seen by telescope on the planet Mars.
Word Originlate Middle English: from Old French, alteration of chanel ‘channel’, from Latin canalis ‘pipe, groove, channel’, from canna ‘cane’.