plural noun
Che·​lyd·​ri·​dae | \kəˈlidrəˌdē\

Definition of Chelydridae 

: a family of large powerful freshwater turtles of North America and Central America including the snapping turtles (see snapping turtle sense 1) and the alligator turtle

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History and Etymology for Chelydridae

borrowed from New Latin, from Chelydra chelydra + -idae -idae

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full of whispering sounds

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