Noun
English Wikipedia has an article on:Cephalic disordersWikipedia
holoprosencephaly (countable and uncountable, plural holoprosencephalies)
(teratology) A congenital disorder involving insufficient division of the lobes of the brain during fetal development, resulting in skull and facial deformities ranging from minor cleft lip problems to cyclopia, in which a single eye develops where the nose would normally be.