iridescent vs moiré

iridescent

adj
  • Producing a display of lustrous, rainbow-like colors; prismatic. 

  • Brilliant, lustrous, or colorful. 

moiré

verb
  • To give a watered or clouded appearance to (a surface). 

noun
  • A fabric, often silk, which has a watery or wavelike appearance. 

  • A pattern that emerges when two grids are superimposed over one another, sometimes unintended or undesirable in many applications such as in weaving and screenprinting. 

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