Congenital anomaly resulting from the failure of facial structures in the embryo to fuse properly.
See also: orofacial cleft
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 753 (https://doi.org/10.1515/pac-2015-1202)