cladoceran Syllabification: (cla·doc·er·an)Pronunciation: /kləˈdäsərən/ ZoologyDefinition of cladoceran noun a minute branchiopod crustacean of the order Cladocera, which includes the water fleas. adjective relating to or denoting cladocerans. cladoceran in other Oxford dictionaries Definition of cladoceran in the British & World English dictionary