Medical Dictionary
acrania
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noun
acra·nia
\(ˈ)ā-ˈkrā-nē-ə\
Medical Definition of acrania
: congenital partial or total absence of the skull
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Acrania
noun plural
acra·nia
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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