What is the meaning of ACRAN. Phrases containing ACRAN
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Acronyms & AI meanings
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ACRAN
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n.
Partial or total absence of the skull.
a.
Wanting a skull.
n.
A fishlike creature (Amphioxus lanceolatus), two or three inches long, found in temperature seas; -- also called the lancelet. Its body is pointed at both ends. It is the lowest and most generalized of the vertebrates, having neither brain, skull, vertebrae, nor red blood. It forms the type of the group Acrania, Leptocardia, etc.
n.
The lowest group of Vertebrata, including the amphioxus, in which no skull exists.
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