noun Etymology: New Latin Schistosoma, from Greek schistos + sōma body any of a genus (Schistosoma) of elongated trematode worms with the sexes separate that parasitize the blood vessels of birds and mammals and cause a destructive human schistosomiasis; broadly a worm of the family (Schistosomatidae) that includes this genus • schistosomal adjective • schistosome adjective