• WordNet 3.6
    • adj prognathous having a projecting lower jaw
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Webster's Revised Unabridged Dictionary
    • a Prognathous (Anat) Having the jaws projecting beyond the upper part of the face; -- opposed to orthognathous. See Gnathic index, under Gnathic. "Their countenances had the true prognathous character."
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Century Dictionary and Cyclopedia
    • prognathous Same as prognathic: opposed to opisthognathous and orthognathous.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Prognathous prog′nā-thus having jaws projecting far forward—also Prognath′ic
    • ***


Webster's Revised Unabridged Dictionary
Gr. before + the jaw
Chambers's Twentieth Century Dictionary
Gr. pro, forward, gnathos, a jaw.


In literature:

The chin was not in the least prognathous, but very well formed.
"Ireland Under Coercion (2nd ed.) (1 of 2) (1888)" by William Henry Hurlbert
Then comes the Negro down in the alluvia, with dark skin, woolly hair, and prognathous development.
"History of the Negro Race in America From 1619 to 1880. Vol 1" by George W. Williams
The Waiyau are far from a handsome race, but they are not the prognathous beings one sees on the West Coast either.
"The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume I (of 2), 1866-1868" by David Livingstone
The people are seldom prognathous, yet individuals are met with who are markedly so (Plate V).
"The Wild Tribes of Davao District, Mindanao" by Fay-Cooper Cole
Prognathism, in anthropological language, means that particular projection of the jaw which modifies the facial angle.
"A Journey to the Centre of the Earth" by Jules Verne
There is no prognathism.
"The Mind of the Child, Part II" by W. Preyer
The Aeta have practically no prognathism.
"Negritos of Zambales" by William Allan Reed
Looking him well over, she noted his big, muscular frame, his steel-gray eyes, and determined, prognathous jaw.
"The Easiest Way" by Eugene Walter and Arthur Hornblow
Young monkeys and young negroes, however, are not prognathous like their parents, but become so as they grow older.
"Cotton is King and The Pro-Slavery Arguments" by Various
The Akkas, as described by him, have large heads, huge ears, and very prognathous faces.
"Man And His Ancestor" by Charles Morris

In science:

Table 10: Measures of facial prognathism in males from modern living populations.
Evaluating Intraspecific Variation and Interspecific Diversity: comparing humans and fish species