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Definition of LYMNAEIDAE
: a family of thin-shelled air-breathing freshwater snails (suborder Basommatophora) that have an elongate ovoidal shell with a large opening and a simple lip and that include numerous species important as intermediate hosts of trematode worms—see fossaria, galba, lymnaea
—lym·nae·id\-ˈnē-id\adjective or noun
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