Oncomelania
noun
On·co·me·la·nia
| \ ˌäŋ-kō-mi-ˈlā-nē-ə
\
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Medical Definition of Oncomelania
: a genus of amphibious snails (family Bulimidae) of Asian and Pacific island freshwaters that comprises forms which are intermediate hosts of a schistosome (Schistosoma japonicum)