plural noun
Fu·​su·​lin·​i·​dae | \ ˌfyüzəˈlinəˌdē\

Definition of Fusulinidae

: a large family of Paleozoic foraminiferans known from their tests which form a major component of one widely distributed kind of Carboniferous limestone

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History and Etymology for Fusulinidae

New Latin, from Fusulina, type genus + -idae

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to spread over or through

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