From Longman Dictionary of Contemporary Englishwater poloˈwater ˌpolo noun [uncountable] DSOa ball game played in water between two teams
Examples from the Corpus
water polo• Has to be team handball, an exciting blend of basketball, soccer, hockey and water polo.• In the afternoon, swimming games water polo, diving etc.• One weekend last month, water polo player Kirk Everist did something for his soul instead of his sport.• Louis, where the water polo competition was staged in an artificial pond. 