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From: Webster's Revised Unabridged Dictionary (1913)

 Bron·to·zo·um 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.
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