One of the mysteries of the English language finally explained.
Any of various carnivorous theropod dinosaurs constituting the Cretaceous infraorder Deinonychosauria, characterized by a large recurved claw on the second toe, and many bird-like features that may have included feathers.
1960s. From Deinonychus + -o- + -saur, after scientific Latin Deinonychosauria, infraorder name.
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