資料來源 : pyDict

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資料來源 : Webster's Revised Unabridged Dictionary (1913)

Acrania \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.