| acrania | 1. <physiology> Partial or total absence of the skull. 2. <zoology> The lowest group of Vertebrata, including the amphioxus, in which no skull exists. Origin: NL, from Gr. Priv. + skull. Source: Websters Dictionary (01 Mar 1998) |
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| acranial | Having no cranium; relating to acrania or an acranius. (05 Mar 2000) |
| acrania |
a developmental anomaly characterized by partial or complete absence of the skull (calvaria).
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| acranial |
having no cranium.
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| Acraniata |
a subphylum of Chordata comprising species without a true skull.
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| acraniate m. |
acranius.
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