Bron`to*zo"um (?), n. [NL., fr. Gr. thunder + animal.] Paleon.

An extinct animal of large size, known from its three-toed footprints in Mesozoic sandstone.

⇒ 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.

 

© Webster 1913.

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