Planorbidae
noun plural
Pla·nor·bi·dae
plə-ˈnȯr-bə-ˌdē
: a family of freshwater pulmonate snails having a single pair of tentacles with an eye at the base of each and gills as well as lungs and including numerous forms important as intermediate hosts of pathogenic trematode worms see planorbis
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Merriam-Webster unabridged
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