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Meaning of ACRANIA

 
Webster's 1913 Dictionary
 
 Definition: 
\A*cra"ni*a\, n. [NL., from Gr. 'a priv. + ? skull.]
1. (Physiol.) Partial or total absence of the skull.

2. pl. (Zo["o]l.) The lowest group of Vertebrata, including
   the amphioxus, in which no skull exists.

 

 

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