-gnathous Definition
 nəthəs 
    suffix
  
 Having a specified kind of jaw.
 Metagnathous.
 American Heritage 
    affix
  
 Having a (specified kind of) jaw.
 Prognathous.
 Webster's New World 
Origin of -gnathous
-  
New Latin -gnathus from Greek -gnathos from gnathos jaw genu-2 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 Ancient Greek γνάθος (gnathos)
From Wiktionary
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