antipodal vs diametral

antipodal

adj
  • diametrically opposite 

  • On opposite sides of the globe; pertaining to antipodes 

noun
  • One of the cells at the chalazal pole of an embryo sac. 

diametral

adj
  • Contrary; diametrically opposed. 

  • Of, relating to, or measured across a diameter. 

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