Clypeastrina

plural noun

Clyp·​e·​as·​tri·​na

-əˈstrīnə,

-rēnə

: 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

Word History

Etymology

New Latin, from Clypeaster + -ina

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