emulsion vs tooth enamel

emulsion

noun
  • The coating of photosensitive silver halide grains in a thin gelatine layer on a photographic film. 

  • A stable suspension of small droplets of one liquid in another with which it is immiscible. 

  • A colloid in which both phases are liquid. 

verb
  • To paint with emulsion paint. 

tooth enamel

noun
  • The hard, mineralised substance that makes up the visible part of teeth. 

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