Definition of prognathous in English:



  • 1(especially of a person) having a projecting lower jaw or chin.

    1. 1.1(of a jaw or chin) projecting.
      • ‘Although the head is worn, a detail shows that the lower part of the face extends down to the trachea at the base of the neck; this roughened area, too massive to be simply a prognathous jaw, must instead represent a full beard.’
      • ‘Exceedingly tall and gaunt with a long, prognathous jaw, he never took his eyes from me as he went over to an accordion wilted across a stool.’
      • ‘The prognathous jaw became a sign of lower development and of a closer relationship to primitive man.’
      • ‘Enlarged as though in a magnifying mirror, the abundant follicles sprout gut-string stubble as a gentle sleeping smile winks above the prognathous jaw.’
    2. 1.2(of an insect) having projecting mouthparts.


Mid 19th century: from pro- before + Greek gnathos jaw + -ous.