单词：abaxial 

形容词

• 
  [1.a.abaxial] (同义词:[abaxial( adj. 离轴的 )]  [dorsal( adj. 背的, 脊的 )]  )
• 
  注释列句：facing away from the axis of an organ or organism; "the abaxial surface of a leaf is the underside or side facing away from the stem"
• 所 有 -> [biology( n. 生物学, 生物(总称) )] 
  种 类 -> [biology( n. 生物学, 生物(总称) )] 
  反义词 -> [adaxial( adj. 近轴的 )]