The Collaborative International Dictionary of English v.0.48:

Primordial \Pri*mor"di*al\, a. [L. primordialis, from primordium
   the first beginning; primus first + ordiri to begin a web, to
   begin: cf. F. primordial.]
   1. First in order; primary; original; of earliest origin; as,
      primordial condition. "The primordial facts of our
      intelligent nature." --Sir W. Hamilton.
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   2. (Geol.) Of or pertaining to the lowest beds of the
      Silurian age, corresponding to the Acadian and Potsdam
      periods in American geology. It is called also Cambrian,
      and by many geologists is separated from the Silurian.
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   3. (Biol.) Originally or earliest formed in the growth of an
      individual or organ; as, a primordial leaf; a primordial
      cell.
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   Primordial utricle (Bot.), the interior lining of a young
      vegetable cell.
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