Late 19th century; earliest use found in Henry Morton Stanley (1841–1904), explorer and journalist. From pro- + -gnathy, after prognathous and prognathic.
Definition of prognathy in US English:
prognathy
nounˈprɒɡnəθi
Anthropology
Prognathism.
Origin
Late 19th century; earliest use found in Henry Morton Stanley (1841–1904), explorer and journalist. From pro- + -gnathy, after prognathous and prognathic.