plural noun Clyp·e·as·tri·na \-əˈstrīnə, -rēnə\

Definition of Clypeastrina

  1. :  a suborder of sea urchins (order Exocycloida) comprising a large number of flattened more or less discoidal sea urchins (as the cake urchins and sand dollars) — compare spatangina

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Origin and Etymology of clypeastrina

New Latin, from Clypeaster + -ina

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capable of being understood in two ways

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