arable vs gravid

arable

adj
  • Under cultivation (within any quinquennial period) for the production of crops sown and harvested within the same agricultural year (contrasted with permanently-cropped lands such as orchards). 

  • Able to be plowed or tilled, capable of growing crops (traditionally contrasted with pasturable lands such as heaths). 

gravid

adj
  • Pregnant. 

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