In zoology, describing an organism with two distinct body cavities or chambers, particularly in reference to vertebrate spinal structures.
From Greek 'di-' (two) and 'coelian' from 'coelos' (hollow or cavity). Formed as a technical anatomical term describing body structures.
Some ancient fish fossils show dicoelious vertebrae—they literally had double-chambered backbones, representing an evolutionary stepping stone between fish with simple spines and modern vertebrates with complex spinal structures!
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