acrania

noun
acra·​nia | \ (ˈ)ā-ˈkrā-nē-ə How to pronounce acrania (audio) \

Medical Definition of acrania

 (Entry 1 of 2)

: congenital partial or total absence of the skull

Acrania

noun plural

Medical Definition of Acrania (Entry 2 of 2)

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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