1) Biotechnology 2) Germfree 3) Pure culture 1) Germfree 2) Pure 
In biology, axenic describes the state of a culture in which only a single species, variety, or strain of organism is present and entirely free of all other contaminating organisms. The earliest axenic cultures were of bacteria or unicellular eukaryotes, but axenic cultures of many multicellular organisms are also possible. Axenic culture is also ...
<biology> A situation in which only one species is present. Thus an axenic culture is uncontaminated by organisms of other species, an axenic organism does not have commensal organisms in the gut etc. ... Some organisms have obligate symbionts and cannot be grown axenically. ... (18 Nov 1997) ... 
(a-zen´ik) not contaminated by or associated with any foreign organisms; used in reference to pure cultures of microorganisms or to germ-free animals.
Pure, uncontaminated e.g. an axenic culture is a pure culture.A situation in which only one species is present. Thus an axenic culture is uncontaminated by organisms of other species, an axenic organism does not have commensal organisms in the gut etc. Some organisms have obligate symbionts and cannot be grown axenically.
Type: Term Pronunciation: ā-zen′ik Definitions: 1. Sterile, denoting especially a pure culture. Also used to denote 'germ-free' animals born and raised in a sterile environment.
[adj] - (of experimental animals) raised under sterile conditions 2. [adj] - used of cultures of microorganisms
axenic 1. Not contaminated by or associated with any foreign organisms, used in reference to pure cultures of microorganisms or to germ-free animals. 2. A reference to a pure culture free from contaminant organisms. 3. Free from contamination.
adjective used of cultures of microorganisms; not contaminated by or completely free of the presence of other organisms; `an axenic culture`
(of an experimental animal) raised under sterile conditions; germfree. · (of a laboratory culture) uncontaminated.