Fas·ci·o·loi·des | \ fə-ˌsē-ə-ˈlȯid-(ˌ)ēz 
, -ˌsī- \
, -ˌsī- \Medical Definition of Fascioloides
: a genus of trematode worms of the family Fasciolidae including the giant liver flukes of ruminant mammals that are serious pests of livestock and game in parts of western North America
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