a toothed aquatic bird of the extinct genus Hesperornis, fossils of which are found in rocks of Cretaceous age in Kansas, having the rear legs modified for swimming and reaching a length of more than 4 feet (1.2 meters).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use hesperornis in a sentence
It was over twenty feet across his wings, from tip to tip; and, like the hesperornis, he always had fish for dinner.The Adventures of a Grain of Dust | Hallam Hawksworth
The swimming hesperornis (see Odontornithes) was also devoid of such a structure.
This order includes only an extinct N. American bird hesperornis.The Vertebrate Skeleton | Sidney H. Reynolds
They are of two leading types, of which the Ichthyornis and hesperornis are the standard specimens.The Story of Evolution | Joseph McCabe
Another (hesperornis regalis) stood five or six feet high, and had rudimentary wings like those of the Penguins.The Chain of Life in Geological Time | Sir J. William Dawson