protovertebra
/ˌprəʊtəʊˈvəːtɪbrə/noun
Embryology. Each of the segments of the embryonic mesoderm which subsequently develop into the vertebrae and associated muscles. Formerly also: †a myotome, regarded as having a similar role ( obsolete ). Now rare.
Origin
Mid 19th century (in an earlier sense). From proto- + vertebra.
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