(Treacher Collins deformity) a hereditary disorder of facial development. It is characterized by underdevelopment of the jaw and zygomatic (cheek) bones and the precursors of the ear fail to develop, which results in a variety of ear and facial malformations. The ear abnormality may cause deafness. E. Treacher Collins (1862–1919), British ophthalmologist
Subjects: Medicine and Health.