One of the mysteries of the English language finally explained.
1Anatomy and Zoology. In forms mesocele, mesocoele. The cerebral aqueduct or its embryonic precursor. rare.
2Zoology. The middle division of a tripartite coelom; (in hemichordates) the coelomic compartment of the mesosoma or collar; (in echinoderms) the part of the coelom forming the water-vascular system.
Late 19th century. From meso- + -coele, in sense 1 after mesocoelia.
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