anneal vs glassify

anneal

verb
  • To cool glass slowly, to minimize internal stress. 

  • To subject to great heat and then (often slow) cooling, and sometimes reheating and further cooling, for the purpose of rendering less brittle; to temper; to toughen. 

  • To make a double-stranded nucleic acid by pairing a single strand with a complementary strand. 

noun
  • An act of annealing. 

glassify

verb
  • To convert (radioactive waste) into a glasslike substance for long-term storage. 

  • Synonym of vitrify: to convert a silica-bearing material to a glasslike substance by applying heat. 

  • To the convert sand or soil of (a particular geographic area) to a glasslike state using the heat from a thermonuclear detonation. 

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