sporocyst Syllabification: (spo·ro·cyst)Pronunciation: /ˈspôrəˌsist/Definition of sporocyst noun Zoology a parasitic fluke in the initial stage of infection in a snail host, developed from a miracidium. (in parasitic sporozoans) an encysted zygote in an invertebrate host. sporocyst in other Oxford dictionaries Definition of sporocyst in the British & World English dictionary