• Webster's Revised Unabridged Dictionary
    • n Hesperornis (Paleon) A genus of large, extinct, wingless birds from the Cretaceous deposits of Kansas, belonging to the Odontornithes. They had teeth, and were essentially carnivorous swimming ostriches. Several species are known. See Illust. in Append.
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Century Dictionary and Cyclopedia
    • n hesperornis The typical genus of fossil birds of the family Hesperornithidæ. The best-known species is H. regalis, discovered in 1870 in the yellow chalk of the pteranodon beds of Kansas. O. C. Marsh, 1872.
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Chambers's Twentieth Century Dictionary
    • n Hesperornis hes-per-ōr′nis an extinct form of bird, the remains of which have been met with in the American cretaceous deposits.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. western + , , a bird
Chambers's Twentieth Century Dictionary
Gr. hesperos, western, ornis, a bird.


In literature:

The less numerous Hesperornis group were large and powerful divers.
"The Story of Evolution" by Joseph McCabe
They've named him the "Hesperornis," which means "western bird.
"The Adventures of a Grain of Dust" by Hallam Hawksworth

In poetry:

Pause and ponder: who could write
A triolet or roundelay
While a Megatherium yawped all night
And a Hesperornis yamped all day,
While now and again the bray sonorous
Of Glyptodon Asper swelled the chorus?
"Extinct Monsters" by Eugene Field