plural noun
Gym·​no·​din·​i·​a·​ce·​ae | \-ˌdinēˈāsēˌē\

Definition of Gymnodiniaceae 

: a family of typically brownish algae (class Dinophyceae) that includes Gymnodinium and related genera when these are considered to be algae

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History and Etymology for Gymnodiniaceae

New Latin, from Gymnodinium, type genus + -aceae

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obstinately defiant of authority

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