The Collaborative International Dictionary of English v.0.48:

Archeus \Ar*che"us\, n. [LL. arch[=e]us, Gr. 'archai^os ancient,
   primeval, fr. 'archh` beginning. See Archi-, pref.]
   The vital principle or force which (according to the
   Paracelsians) presides over the growth and continuation of
   living beings; the anima mundi or plastic power of the old
   philosophers. [Obs.] --Johnson.
   [1913 Webster]