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From The Collaborative International Dictionary of English v.0.48:
Canal \Ca*nal"\, n. [F. canal, from L. canalis canal, channel; prob. from a root signifying "to cut"; cf. D. kanaal, fr. the French. Cf. Channel, Kennel gutter.] [1913 Webster] 1. An artificial channel filled with water and designed for navigation, or for irrigating land, etc. [1913 Webster] 2. (Anat.) A tube or duct; as, the alimentary canal; the semicircular canals of the ear. [1913 Webster] 3. A long and relatively narrow arm of the sea, approximately uniform in width; -- used chiefly in proper names; as, Portland Canal; Lynn Canal. [Alaska] [Webster 1913 Suppl.] Canal boat, a boat for use on a canal; esp. one of peculiar shape, carrying freight, and drawn by horses walking on the towpath beside the canal. Canal lock. See Lock. [1913 Webster]