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noun Brontozoum n. (Paleon.) An extinct animal of large size, known from its three-toed footprints in Mesozoic sandstone. Note: The tracks made by these reptiles are found eighteen inches in length, and were formerly referred to gigantic birds; but the discovery of large bipedal three-toed dinosaurs has suggested that they were made by those reptiles.
Collaborative International Dictionary of English 0.48
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