desiccant vs exsuccous

desiccant

adj
  • Causing dryness. 

noun
  • A substance (such as calcium oxide or silica gel) that is used as a drying agent because of its high affinity for water. 

exsuccous

adj
  • Without juice or sap. Completely dry. 

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