trigonocephaly

noun
tri·​go·​no·​ceph·​a·​ly | \ˌtrig-ə-nə-ˈsef-ə-lē, ˌtrī-ˌgō-nō- \
plural trigonocephalies

Medical Definition of trigonocephaly 

: a congenital deformity in which the head is somewhat triangular and flat

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