schis·to·some (shĭs'tə-sōm') n. Any of several chiefly tropical trematode worms of the genus Schistosoma, many of which are parasitic in the blood of humans and other mammals. Also called bilharzia, blood fluke.
[New Latin Schistosōma, genus name : Greek skhistos, split; see schist + Greek sōma, body; see -some3.] schis'to·som'al (-sō'məl) adj.