One of the mysteries of the English language finally explained.
Lacking a skull or cranium; (formerly) specifically belonging to the subphylum Cephalochordata (formerly Acrania) of primitive vertebrates lacking braincases.
An acraniate organism; especially a cephalochordate.
Late 19th century; earliest use found in Canadian Journal. Either from a- + craniate, or from scientific Latin Acrania + -ate.
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