1) Hypognathous 2) Lantern-jawed 3) Prognathous 1) Hypognathous 2) Prognathous 
having a jaw that projects forward
• (a.) Prognathous.
a prominent lower jaw which may bring the lower teeth ahead of the upper teeth
Prog·nath'ic adjective (Anat.) Prognathous. 
Type: Term Pronunciation: prog-nath′ik, -nā′thik Definitions: 1. Having a projecting jaw; having a gnathic index above 103. 2. Denoting a forward projection of either or both of the jaws relative to the craniofacial skeleton. Synonyms: prognathous