Planariidae
noun plural
Plan·a·ri·idae
| \ ˌplan-ə-ˈrī-ə-ˌdē
\
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Medical Definition of Planariidae
: a large family of small soft-bodied usually leaf-shaped flatworms of the order Tricladida that are almost all free-living in fresh water and often have well-developed eyespots — see planaria