Medical Dictionary

acrania

noun acra·nia \ (ˈ)ā-ˈkrā-nē-ə \

medical Definition of acrania

: congenital partial or total absence of the skull

Acrania

noun plural

medical Definition of Acrania

in some classifications
: a division of the phylum or subkingdom Chordata comprising the hemichordates, tunicates, and lancelets and including all the chordates without true heads and anterior brains — compare vertebrata

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