1. Relating to a primordium. 2. Relating to a structure in its first or earliest stage of development. SYN: primal (2), primitive.
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pri·mor·di·al prī-'mȯrd-ē-əl adj earliest formed in the growth of an individual or organ: PRIMITIVE <the \primordial skeleton>
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adj.
(in embryology) describing cells or tissues that are formed in the early stages of embryonic development.
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pri·mor·di·al (pri-morґde-əl) [L. primordialis] original or primitive; of the simplest and most undeveloped character.Medical dictionary. 2011.