Waterloo (wôtərlōˈ) [key]. 1 City (1991 pop. 71,181), SE Ont., Canada. It adjoins Kitchener. Several large insurance companies have their main offices there, and the adjoining cities form a high technology hub. Other industries include distilleries and plants making furniture, farm machinery, and metal products. The district was settled (1800–1805) by Mennonites from Pennsylvania. The Univ. of Waterloo and Wilfrid Laurier Univ. are there. 2 Town (1991 pop. 3,964), S Que., Canada, SE of Montreal. It is the center of a farming region known for its mushrooms. Manufactures include plastics, wire goods, and baby carriages.