Bible Dictionaries
Acrania
Webster's Dictionary
(1):
(n.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists.
(2):
(n.) Partial or total absence of the skull.
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Bibliography Information
Webster, Noah. Entry for 'Acrania'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/acrania.html. 1828.