detergent vs smectic

detergent

adj
  • Synonym of cleansing. 

noun
  • Any non-soap cleaning agent, especially a synthetic surfactant. 

smectic

adj
  • Cleansing. 

  • Astringent; detergent. 

  • Describing a class of liquid crystals whose molecules are aligned in layers, with the molecules lying perpendicular to the plane of the layers. 

noun
  • A liquid crystal having the molecules aligned in this way. 

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