internal vs medial

internal

adj
  • Within the body. 

  • Concerned with the domestic affairs of a nation, state or other political community. 

  • Of the inner nature of a thing. 

  • Applied or intended for application through the stomach by being swallowed. 

  • Concerned with the non-public affairs of a company or other organisation. 

  • Attending a university as well as taking its examinations. 

  • Of or situated on the inside. 

  • Experienced in one's mind; inner rather than expressed. 

  • Present or arising within an organism or one of its parts. 

medial

adj
  • Pertaining to the inside; closer to the median plane of the body or the midline of an organ. 

  • Of or pertaining to the media and/or the areas of the wing next to it. 

  • (of a speech sound) In the middle of a word. 

  • Closer to the addressee. 

  • Of or pertaining to a mean or average. 

  • Pertaining to the middle layer of a blood vessel, to its tunica media. 

  • (of a consonant) Central: produced when air flows across the center of the mouth over the tongue. 

noun
  • One or more letters that occur in the middle of a word. 

  • Any of various things that occur in the middle. 

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