Welland Canal (?w?l?nd) n (Placename) a canal in S Canada, in Ontario, linking Lake Erie to Lake Ontario: part of the St Lawrence Seaway, with eight locks. Length: 44 km (28 miles). Also called: Welland Ship Canal Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014