chondromere

A cartilage unit of the fetal axial skeleton developing within a single metamere of the body; a primordial cartilaginous vertebra together with its costal component. [chondro- + G. meros, part]

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chon·dro·mere (konґdro-mēr) [chondro- + -mere] a cartilaginous vertebra of the fetal vertebral column.