pachycephalia

noun
pachy·​ce·​pha·​lia | \ˌpak-ē-sə-ˈfā-lē-ə \
variants: or pachycephaly \ ˌpak-​i-​ˈsef-​ə-​lē \
plural pachycephalias or pachycephalies

Medical Definition of pachycephalia 

: thickness of the skull or head

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