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noun Pterosauria n. pl. (Paleon.) An extinct order of flying reptiles of the Mesozoic age; the pterodactyls; called also Pterodactyli, and Ornithosauria. Note: The wings were formed, like those of bats, by a leathery expansion of the skin, principally supported by the greatly enlarged outer or " little" fingers of the hands. The American Cretaceous pterodactyls had no teeth. See Pteranodontia, and Pterodactyl.
Collaborative International Dictionary of English 0.48
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