abaxial vs dorsal

abaxial

adj
  • Of a side that is facing away from the axis or central line, such as the underside of a leaf; or the back of an animal. 

  • Not in the axis. Applied to an embryo placed out of the axis of the seed. 

dorsal

adj
  • Relating to the surface naturally inferior, as of a leaf. 

  • Relating to the surface naturally superior, as of a creeping hepatic moss. 

  • Having only one sharp side. 

  • Relating to the top surface of the foot or hand. 

  • Produced using the dorsum of the tongue. 

noun
  • A hanging, usually of rich stuff, at the back of a throne, altar, etc. 

  • A sound produced using the dorsum of the tongue. 

  • Any of the longitudinal series of plates that encircle the body, excluding the ventral scales. 

How often have the words abaxial and dorsal occurred in a corpus of books? (source: Google Ngram Viewer )