prognathous

 
Pronunciation: /prɒgˈneɪθəs, ˈprɒgnəθəs/

adjective

  • having a projecting lower jaw or chin.
  • (of a lower jaw or chin) projecting: her chin was a little prognathous

Derivatives

prognathic

Pronunciation: /prɒgˈnaθɪk/
adjective

prognathism

noun

Origin:

mid 19th century: from pro-2 'before' + Greek gnathos 'jaw' + -ous