Definify.com
Webster 1913 Edition
Brontozoum
‖
Bronˊto-zo′um
,Noun.
[NL., fr. Gr. [GREEK] thunder + [GREEK] 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.