mandibulofacial dysostosis

noun

man·​di·​bu·​lo·​fa·​cial dysostosis man-ˌdib-yə-lō-ˌfā-shəl- 

: a dysostosis of the face and lower jaw inherited as an autosomal dominant trait and characterized by bilateral malformations, deformities of the outer and middle ear, and a usually smaller lower jaw

called also Treacher Collins syndrome