plural noun
Zy·gop·ter·a·ce·ae | \zīˌgäptəˈrāsēˌē\

Definition of Zygopteraceae 

: a family of primitive Paleozoic ferns of Europe and the U.S. having pinnae in two or four series at an angle to the plane of the leaf blade

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History and Etymology for Zygopteraceae

New Latin, from Zygopteris, type genus + -aceae

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