Congenital anomaly characterized by the absence or extreme underdevelopment of the lower jaw, producing closeness of the ears below the face.
See also: agnathia, synotia
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 788 (https://doi.org/10.1515/pac-2015-1202)