axenic

from WordNet (r) 3.0 (2006)

axenic
    adj 1: (of experimental animals) raised under sterile
           conditions; "axenic conditions"; "germfree animals"
    2: (used of cultures of microorganisms) completely free from
       other organisms; "an axenic culture"

from The Collaborative International Dictionary of English v.0.48

axenic \axenic\ adj.
   1. raised under sterile conditions; -- of experimental
      animals; as, axenic conditions.
      [WordNet 1.5]

   2. pure or completely free of the presence of other
      organisms; -- used of cultures of microorganisms; as, an
      axenic culture.

   Syn: uncontaminated; germ-free.
        [WordNet 1.5]