Brontozoum \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.
[1913 Webster]
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.
[1913 Webster]