‖A‐cra″ni‐a (�), n. [NL., from Gr. ἀ priv. + � skull.] 1. (Physiol.) Partial or total absence of the skull.
2. pl.(Zoöl.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.