dehydrate vs immerge

dehydrate

verb
  • to lose or remove water; to dry 

immerge

verb
  • To plunge into, under, or within anything, especially a fluid; to dip; to immerse. 

  • To disappear by entering into any medium, as a star into the light of the sun. 

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