plural noun
Clau·si·li·i·dae | \ˌklȯzəˈlīəˌdē, -ȯsə-\

Definition of Clausiliidae 

: a family of terrestrial pulmonate snails having a fusiform sinistral spiral shell in which a rodlike clausilium functions as an operculum

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History and Etymology for Clausiliidae

New Latin, from Clausilia, type genus + -idae

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