from The Century Dictionary.
- Without a center; specifically, noting a condition of the vertebral column found in some batrachians and fishes, in which bony neural arches are associated with a persistent notochord which shows no trace of segmentation: said also of cells in which a centrosome or centrosphere cannot be detected.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective ichthyology lacking vertebral
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