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The Collaborative International Dictionary of English v.0.48:

Acrania \A*cra"ni*a\, n. [NL., from Gr. 'a priv. + ? skull.] 1. (Physiol.) Partial or total absence of the skull. [1913 Webster] 2. pl. (Zool.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists. [1913 Webster]