/waw"teuhr looh', wot"euhr-, waw'teuhr looh", wot'euhr-/ ; for 1 also Flem. /vah"teuhrdd loh'/ , n.
1. a village in central Belgium, south of Brussels: Napoleon decisively defeated here on June 18, 1815.
2. a decisive or crushing defeat: The candidate met her Waterloo in the national elections.
3. a city in E Iowa. 75,985.
4. a city in SE Ontario, in S Canada. 49,428.