A term used to indicate that something is free of germs.

  Not contaminated by or associated with any foreign organisms (excepting endogenous retroviruses). A.k.a. germfree.

(adj) (of experimental animals) raised under sterile conditions(adj) (used of cultures of microorganisms) completely free from other organisms

Cultured without any other organism. For example as a broth that sustains growth of the protist.  Many amoebae have been brought into axenic culture although to date (with the possible exception of Trichospherium, which is actually a testate amoeba) no marine gymnamoebae has been successfully brought to axenic condition. [More]