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opiorphin (countable and uncountable, plural opiorphins)

  1. (biochemistry) A painkilling chemical compound first isolated from human saliva. [from 21st c.]
    • 2015, Giulia Enders, translated by David Shaw, Gut, Scribe, published 2016, page 21:
      Our saliva contains one painkiller that is stronger than morphine. It is called opiorphin, and was only discovered in 2006.