Brontozoum
Pronunciation : Bron`to*zo"um
Part of Speech : n.
Etymology : [NL., fr. Gr. (Paleon.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913