dead calm vs vitreous

dead calm

adj
  • Completely still with no waves and no wind. 

noun
  • The condition of a perfectly flat sea with no waves and no wind. 

vitreous

adj
  • Having a shiny nonporous surface. 

  • Of or resembling glass; glassy. 

  • Of a semi-crystalline substance where the atoms exhibit short-range order, but without the long-range order of a crystal. 

  • Of or relating to the vitreous humor of the eye. 

noun
  • The vitreous humor. 

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