单词：axenic 

形容词

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  [1.a.axenic] (同义词:[axenic( adj. [争]无异种生物混杂的, 无外来污染的,无菌的 )]  )
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  注释列句：(of experimental animals) raised under sterile conditions; "axenic conditions"; "germfree animals"
• 近义词 -> [germfree( adj. 无菌的, 在无菌状态下出生的 )] 
  
• 
  [2.a.axenic] (同义词:[axenic( adj. [争]无异种生物混杂的, 无外来污染的,无菌的 )]  )
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  注释列句：(used of cultures of microorganisms) completely free from other organisms; "an axenic culture"
• 近义词 -> [pure( adj. 纯的, 纯粹的, 纯净的, 无垢的, 纯洁的, 完美的, 抽象的 )]