plural noun
Ter·e·bra·tu·li·dae | \ ˌterəbrəˈtüləˌdē , -brə‧ˈtyü- \

Definition of Terebratulidae 

: a large family of living and extinct brachiopods usually placed with a few related forms in a distinct superfamily or suborder of the order Telotremata — see terebratula

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History and Etymology for Terebratulidae

New Latin Terebratula, type genus + -idae

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occurring twice a year or every two years

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