plural noun
Mar·​gi·​nel·​li·​dae | \-ləˌdē\

Definition of Marginellidae 

: a large nearly cosmopolitan family of small marine snails (suborder Stenoglossa) with strong porcelaneous often somewhat pear-shaped shell having a long narrow aperture and a thickened outer lip — see marginella

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History and Etymology for Marginellidae

New Latin, from Marginella, type genus + -idae

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living or existing for a long time

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